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  • 1. Achatz, Johannes Georg
    et al.
    Hooge, Matthew
    Wallberg, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Systematisk biologi.
    Jondelius, Ulf
    Tyler, Seth
    Systematic revision of acoels with 9+0 sperm ultrastructure (Convolutida) and the influence of sexual conflict on morphology2010Ingår i: Journal of Zoological Systematics and Evolutionary Research, ISSN 0947-5745, E-ISSN 1439-0469, Vol. 48, nr 1, s. 9-32Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    We have used newly discerned morphological characters as well as molecular-sequence data from 18S and 28S rDNA to revise the families recently designated as the '9+0' acoels - what we call Convolutida. Characters from the ultrastructure of sperm, with their '9+0' axonemes, are useful in delineating the Convolutida, but are either species-specific or too conserved within the group to be used to infer relationships within it. Male genital organs, prostatoid organs, and sagittocysts, on the other hand, give a good phylogenetic signal for reconstructing relationships of such genera as Conaperta, Anaperus, and Achoerus; some features of the reproductive organs correlate with habitat and show how the Convolutida probably originated as epiphytic predators and radiated into the mesopsammon, pelagic, and coral-associated realms. In this revision of the Convolutida we provide revised synopses of its families - which we restrict to the Anaperidae, Convolutidae, and Sagittiferidae - and describe a new species, Polychoerus gordoni, from New Zealand. We transfer the genus Adenopea from the Antroposthiidae to the Convolutidae; Conaperta, Neochildia, and Oxyposthia from the Convolutidae to the Anaperidae; Paranaperus and Praeanaperus from the Anaperidae to the Haploposthiidae. Convoluta aegyptica is synonymized with Convoluta boehmigi, Convoluta lacazii with Convoluta sordida, and the genus Picola (Convolutidae) with Deuterogonaria (Haploposthiidae). Amphiscolops blumi, A. carvalhoi, and A. langerhansi, all of which possess a cellular seminal bursa, are transferred to the genus Heterochaerus. Convoluta elegans and Pseudanaperus tinctus are classified as nomina nuda. We use our findings on the ultrastructure of female genital organs and spermatozoa to show that sexual conflict plays a major role in the evolution of diversity of these structures and that the phylogeny of the Acoela would comprise early forms without female genital organs and hyper- or hypodermal transfer of sperm through advanced forms with ever longer and narrower bursal nozzles and sperm with axial microtubules. Moreover, our results show that the acquisition of endosymbiotic algae happened at least twice within the Acoela.

  • 2. Atherton, Sarah
    et al.
    Jondelius, Ulf
    A taxonomic review and revisions of Microstomidae (Platyhelminthes: Macrostomorpha)2019Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 14, nr 4, artikel-id e0212073Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Microstomidae (Platyhelminthes: Macrostomorpha) diversity has been almost entirely ignored within recent years, likely due to inconsistent and often old taxonomic literature and a general rarity of sexually mature collected specimens. Herein, we reconstruct the phylogenetic relationships of the group using both previously published and new 18S and CO1 gene sequences. We present some taxonomic revisions of Microstomidae and further describe 8 new species of Microstomum based on both molecular and morphological evidence. Finally, we briefly review the morphological taxonomy of each species and provide a key to aid in future research and identification that is not dependent on reproductive morphology. Our goal is to clarify the taxonomy and facilitate future research into an otherwise very understudied group of tiny (but important) flatworms.

  • 3.
    Atherton, Sarah
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi. Stockholm University.
    A taxonomic review and revisions of Microstomidae (Platyhelminthes: Macrostomorpha)2019Ingår i: PLoS ONE, E-ISSN 1932-6203, Vol. 14, nr 4, artikel-id e0212073Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Microstomidae (Platyhelminthes: Macrostomorpha) diversity has been almost entirely ignored within recent years, likely due to inconsistent and often old taxonomic literature and a general rarity of sexually mature collected specimens. Herein, we reconstruct the phylogenetic relationships of the group using both previously published and new 18S and CO1 gene sequences. We present some taxonomic revisions of Microstomidae and further describe 8 new species of Microstomum based on both molecular and morphological evidence. Finally, we briefly review the morphological taxonomy of each species and provide a key to aid in future research and identification that is not dependent on reproductive morphology. Our goal is to clarify the taxonomy and facilitate future research into an otherwise very understudied group of tiny (but important) flatworms.

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  • 4.
    Atherton, Sarah
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Microstomum (Platyhelminthes, Macrostomorpha, Microstomidae) from the Swedish west coast: two new species and a population description2018Ingår i: European Journal of Taxonomy, ISSN 2118-9773, nr 398, s. 1-18Artikel i tidskrift (Refereegranskat)
  • 5.
    Atherton, Sarah
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Wide distributions and cryptic diversity within a Microstomum (Platyhelminthes) species complex2018Ingår i: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 47, s. 486-498Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Microstomum lineare is a common species of fresh and brackish waters found world-wide. Three genes (18S, CO1 and ITS) were sequenced from specimens of M. lineare collected from four countries, and the levels of cryptic diversity and genetic structuring were assessed. Results showed M. lineare has very wide haplotype distributions suggesting higher than expected dispersal capabilities. In addition, three new species were described on the basis of molecular taxonomy: Microstomum artoisi sp. nov., Microstomum tchaikovskyi sp. nov. and Microstomum zicklerorum sp. nov.

  • 6. Baguñà, Jaume
    et al.
    Ruiz-Trillo, Iñaki
    Paps, Jordi
    Loukota, Mercè
    Ribera, Carles
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Riutort, Marta
    The first bilaterian organisms; simple or complex?: New molecular evidence2001Ingår i: Int. J. Dev. Biol., Vol. 45, s. S133-S134Artikel i tidskrift (Refereegranskat)
  • 7.
    Cannon, Johanna
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi. Auburn University.
    Vellutini, Bruno
    Sars International Centre for Marine Molecular Biology.
    Smith, Julian
    Winthrop University.
    Ronquist, Fredrik
    Naturhistoriska riksmuseet, Enheten för bioinformatik och genetik.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hejnol, Andreas
    Sars International Centre for Marine Molecular Biology.
    Xenacoelomorpha is the sister group to Nephrozoa2016Ingår i: Nature, ISSN ISSN: 0028-0836, Vol. 530, s. 89-93Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The position of Xenacoelomorpha in the tree of life remains a major unresolved question in the study of deep animal relationships1. Xenacoelomorpha, comprising Acoela, Nemertodermatida, and Xenoturbella, are bilaterally symmetrical marine worms that lack several features common to most other bilaterians, for example an anus, nephridia, and a circulatory system. Two conflicting hypotheses are under debate: Xenacoelomorpha is the sister group to all remaining Bilateria (= Nephrozoa, namely protostomes and deuterostomes)2,3 or is a clade inside Deuterostomia4. Thus, determining the phylogenetic position of this clade is pivotal for understanding the early evolution of bilaterian features, or as a case of drastic secondary loss of complexity. Here we show robust phylogenomic support for Xenacoelomorpha as the sister taxon of Nephrozoa. Our phylogenetic analyses, based on 11 novel xenacoelomorph transcriptomes and using different models of evolution under maximum likelihood and Bayesian inference analyses, strongly corroborate this result. Rigorous testing of 25 experimental data sets designed to exclude data partitions and taxa potentially prone to reconstruction biases indicates that long- branch attraction, saturation, and missing data do not influence these results. The sister group relationship between Nephrozoa and Xenacoelomorpha supported by our phylogenomic analyses implies that the last common ancestor of bilaterians was probably a benthic, ciliated acoelomate worm with a single opening into an epithelial gut, and that excretory organs, coelomic cavities, and nerve cords evolved after xenacoelomorphs separated from the stem lineage of Nephrozoa. 

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    fulltext
  • 8.
    Curini-Galletti, Marco
    et al.
    Universita` di Sassari, Italy.
    Artois, Tom
    Hasselt University, Belgium.
    Delogu, Valentina
    Universita` di Sassari, Italy.
    De Smet, Willem H.
    University of Antwerp, Belgium.
    Fontaneto, Diego
    Swedish Museum of Natural History, Sweden; Imperial College London, United Kingdom.
    Jondelius, Ulf
    Swedish Museum of Natural History, Sweden.
    Leasi, Francesca
    Imperial College London, United Kingdom; Universtità di Modena e Reggio Emilia, Italy.
    Martínez, Alejandro
    University of Copenhagen, Denmark.
    Meyer-Wachsmuth, Inga
    Swedish Museum of Natural History, Sweden.
    Nilsson, Karin Sara
    Swedish Museum of Natural History, Sweden.
    Tongiorgi, Paolo
    Universtità di Modena e Reggio Emilia, Italy.
    Worsaae, Katrine
    University of Copenhagen, Denmark.
    Todaro, M. Antonio
    Universtità di Modena e Reggio Emilia, Italy.
    Patterns of Diversity in Soft-Bodied Meiofauna: Dispersal Ability and Body Size Matter2012Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, nr 3, artikel-id e33801Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Biogeographical and macroecological principles are derived from patterns of distribution in large organisms, whereas microscopic ones have often been considered uninteresting, because of their supposed wide distribution. Here, after reporting the results of an intensive faunistic survey of marine microscopic animals (meiofauna) in Northern Sardinia, we test for the effect of body size, dispersal ability, and habitat features on the patterns of distribution of several groups.

    Methodology/Principal Findings: As a dataset we use the results of a workshop held at La Maddalena (Sardinia, Italy) in September 2010, aimed at studying selected taxa of soft-bodied meiofauna (Acoela, Annelida, Gastrotricha, Nemertodermatida, Platyhelminthes and Rotifera), in conjunction with data on the same taxa obtained during a previous workshop hosted at Tja ̈rno ̈ (Western Sweden) in September 2007. Using linear mixed effects models and model averaging while accounting for sampling bias and potential pseudoreplication, we found evidence that: (1) meiofaunal groups with more restricted distribution are the ones with low dispersal potential; (2) meiofaunal groups with higher probability of finding new species for science are the ones with low dispersal potential; (3) the proportion of the global species pool of each meiofaunal group present in each area at the regional scale is negatively related to body size, and positively related to their occurrence in the endobenthic habitat.

    Conclusion/Significance: Our macroecological analysis of meiofauna, in the framework of the ubiquity hypothesis for microscopic organisms, indicates that not only body size but mostly dispersal ability and also occurrence in the endobenthic habitat are important correlates of diversity for these understudied animals, with different importance at different spatial scales. Furthermore, since the Western Mediterranean is one of the best-studied areas in the world, the large number of undescribed species (37%) highlights that the census of marine meiofauna is still very far from being complete. 

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  • 9. Haenel, Quiterie
    Jondelius, Ulf (Medarbetare/bidragsgivare)
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Sundberg, Per (Medarbetare/bidragsgivare)
    Bourlat, Sarah (Medarbetare/bidragsgivare)
    NGS-based biodiversity and community structure analysis of meiofaunal eukaryotes in shell sand from Hållö island, Smögen, and soft mud from Gullmarn Fjord, Sweden2017Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 5, artikel-id e12731Artikel i tidskrift (Refereegranskat)
  • 10.
    Haenel, Quiterie
    et al.
    Göteborgs Universitet.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    sundberg, per
    Göteborgs Universitet.
    Bourlat, Sarah
    Göteborgs Universitet.
    NGS-based biodiversity and community structure analysis of meiofaunal eukaryotes in shell sand from Hållö island, Smögen, and soft mud from Gullmarn Fjord, Sweden2017Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 5Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 11.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bourlat, Sarah (Medarbetare/bidragsgivare)
    Jondelius, Ulf (Medarbetare/bidragsgivare)
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The choice of taxonomy assignment approach has strong impact on the efficiency of identification of OTUs in marine nematodes2017Ingår i: Royal Society Open Science, E-ISSN 2054-5703, Vol. 4, artikel-id 170315Artikel i tidskrift (Refereegranskat)
  • 12.
    Holovachov, Oleksandr
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Haenel, Quiterie
    Bourlat, Sarah
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Taxonomy assignment approach determines the efficiency of identification of OTUs in marine nematodes2017Ingår i: Royal Society Open Science, E-ISSN 2054-5703, Vol. 4, nr 8Artikel i tidskrift (Refereegranskat)
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  • 13. Hooge, Matthew
    et al.
    Wallberg, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Systematisk biologi.
    Todt, Christiane
    Maloy, Aaron
    Jondelius, Ulf
    Tyler, Seth
    A revision of the systematics of panther worms (Hofstenia spp., Acoela), with notes on color variation and genetic variation within the genus2007Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 592, s. 439-454Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Species of the genus Hofstenia are voracious predators and among the largest and most colorful of the Acoela. They are known from Japan, the Red Sea, the North Atlantic islands of Bermuda and the Bahamas, and the Caribbean and in a variety of habitats including the rocky intertidal, among Thalassia sea grass, on filamentous algae and decaying mangrove leaves. Certain color morphs associated with each of these habitats seem to have confused the taxonomy of the group. While brown-and-white banding and spotting patterns of Hofstenia miamia and Hofstenia giselae are distinctive for species associated with mangrove leaves and Thallasia sp. and are likely to be cryptic for these specific environments, we find some evidence to suggest that the coloration is mimicry of a nudibranch with aposematic coloration. The common plan in these patterns is one with three variously solid or spotted lighter cross bands on a dark background. Our examination of museum type material and live specimens of Hofstenia collected from Bahamas, Belize, Bermuda, and Panama revealed no internal morphological differences between the Hofstenia species occurring in the Caribbean. Similarly, our analyses of 18S and 28S molecular sequence data revealed no significant differences among specimens. Accordingly, we declare that Hofstenia giselae is a junior synonym of Hofstenia miamia, the three- banded panther worm.

  • 14.
    Jondelius, Ulf
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi. Systematic Zoology.
    Larsson, Karolina
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi. Systematic Zoology.
    Raikova, Olga
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi. Systematic Zoology.
    Cleavage in Nemertoderma westbladi (Nemertodermatida) and its phylogenetic significance2004Ingår i: Zoomorphology, Vol. 123, s. 221-225Artikel i tidskrift (Refereegranskat)
  • 15.
    Jondelius, Ulf
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Meyer-Wachsmuth, Inga
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hyper-cryptic marine meiofauna: species complexes in Nemertodermatida2014Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, nr 9, artikel-id e107688Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    meyer-Wachsmuth & Jondelius 2014
  • 16.
    Jondelius, Ulf
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Norén, Michael
    Hendelberg, Jan
    The Prolecithophora2000Ingår i: Interrelationships of the Platyhelminthes, CRC Press, London , 2000, s. 74-80Kapitel i bok, del av antologi (Refereegranskat)
  • 17.
    Jondelius, Ulf
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Raikova, Olga
    Russian Academy of Sciences.
    Martinez, Pedro
    University of Barcelona.
    Xenacoelomorpha, a Key Group to Understand Bilaterian Evolution: Morphological and Molecular Perspectives.2019Ingår i: Evolution, Origin of Life, Concepts and Methods. / [ed] Pontarotti, Cham: Springer, 2019, s. 287-315Kapitel i bok, del av antologi (Refereegranskat)
  • 18.
    Jondelius, Ulf
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Ruiz-Trillo, Iñaki
    Baguñà, Jaume
    Riutort, Marta
    The Nemertodermatida are basal bilaterians and not members of the Platyhelminthes2002Ingår i: Zoologica Scripta, Vol. 31, s. 201-215Artikel i tidskrift (Refereegranskat)
  • 19. Jondelius, Ulf
    et al.
    Wallberg, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Systematisk biologi.
    Hooge, Matthew
    Raikova, Olga I.
    How the Worm Got its Pharynx: Phylogeny, Classification and Bayesian Assessment of Character Evolution in Acoela2011Ingår i: Systematic Biology, ISSN 1063-5157, E-ISSN 1076-836X, Vol. 60, nr 6, s. 845-871Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Acoela are marine microscopic worms currently thought to be the sister taxon of all other bilaterians. Acoels have long been used as models in evolutionary scenarios, and generalized conclusions about acoel and bilaterian ancestral features are frequently drawn from studies of single acoel species. There is no extensive phylogenetic study of Acoela and the taxonomy of the 380 species is chaotic. Here we use two nuclear ribosomal genes and one mitochondrial gene in combination with 37 morphological characters in an analysis of 126 acoel terminals (about one-third of the described species) to estimate the phylogeny and character evolution of Acoela. We present an estimate of posterior probabilities for ancestral character states at 31 control nodes in the phylogeny. The overall reconstruction signal based on the shape of the posterior distribution of character states was computed for all morphological characters and control nodes to assess how well these were reconstructed. The body-wall musculature appears more clearly reconstructed than the reproductive organs. Posterior similarity to the root was calculated by averaging the divergence between the posterior distributions at the nodes and the root over all morphological characters. Diopisthoporidae is the sister group to all other acoels and has the highest posterior similarity to the root. Convolutidae, including several "model" acoels, is most divergent. Finally, we present a phylogenetic classification of Acoela down to the family level where six previous family level taxa are synonymized.

  • 20.
    Jondelius, Ulf
    et al.
    Department of Invertebrate Zoology, Swedish Museum of Natural History.
    Wallberg, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk biologi.
    Hooge, Matthew
    School of Biology and Ecology, University of Maine, Orono, ME, USA.
    Raikova, Olga
    Russian Acad Sci, Inst Zool, St Petersburg 199034, Russia.
    Tyler, Seth
    School of Biology and Ecology, University of Maine, Orono, ME, USA.
    How the Worm Lost its Pharynx: Phylogeny, Classification and Bayesian assessment of Character Evolution in AcoelaManuskript (preprint) (Övrig (populärvetenskap, debatt, mm))
  • 21. Kånneby, Tobias
    et al.
    Bernvi, David C
    Naturhistoriska riksmuseet, Enheten för zoologi. Stockholm University.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi. Stockholm University.
    Distribution, delimitation and description of species of Archaphanostoma (Acoela)2014Ingår i: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 44, nr 2, artikel-id 218-231Artikel i tidskrift (Refereegranskat)
  • 22.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Four new species of Acoela from Chile2013Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3736, nr 5, s. 471-485Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Acoels are with few exceptions marine worms and a common component of the interstitial meiofauna. In this study we present new species to science belonging to Isodiametridae and Solenofilomorphidae. The new species, Isodiametra finkei n. sp., Postaphanostoma nilssoni n. sp., Pseudaphanostoma hyalinorhabdoida n. sp. and Solenofilomorpha pellucida n. sp. were all collected in Chile during March 2012. Nucleotide sequences for the ribosomal genes 18S rDNA and 28S rDNA as well as COI mtDNA have been determined for the new species and used in a maximum likelihood analysis to further support their classification.

  • 23.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden2012Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 683, s. 185-202Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Gastrotricha is a cosmopolitan group of aquatic invertebrates. To date, approximately 765 species have been described. This study is the first to deal with species delimitation and cryptic species of freshwater Gastrotricha. Three commonly encountered species, Heterolepidoderma ocellatum, Lepidochaetus zelinkai, and Lepidodermella squamata, are investigated for cryptic speciation. Most of the material is based on Swedish specimens but closely related species from other parts of the world are also included. Taxonomic revisions are supported by phylogenies based on 18S rRNA, 28S rRNA, and COI mtDNA of freshwater Chaetonotidae from several genera and inferred from Bayesian and maximum likelihood approaches. Heterolepidoderma ocellatum f. sphagnophilum is raised to species level, under the name H. acidophilum n. sp. Moreover, genetic data based on COI indicate large variation between two morphologically very similar groups of Lepidodermella squamata. The extent of cryptic speciation in L. zelinkai appears low. Based on the phylogenetic hypothesis presented in this article, the new species, Lepidodermella intermedia n. sp., from northern Sweden is also described. The phylogenetic hypothesis generated shows that Chaetonotidae is a nonmonophyletic group.

  • 24.
    Kånneby, Tobias
    et al.
    The Swedish Museum of Natural History .
    Todaro, M. Antonio
    Jondelius, Ulf
    The Swedish Museum of Natural History.
    A Phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden2012Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 683, nr 1, s. 185-202Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Gastrotricha is a cosmopolitan group of aquatic invertebrates. To date approximately 765 species have been described. This study is the first to deal with species delimitation and cryptic species of freshwater Gastrotricha. Three commonly encountered species, Heterolepidoderma ocellatum, Lepidochaetus zelinkai and Lepidodermella squamata, are investigated for cryptic speciation. Most of the material is based on Swedish specimens but closely related species from other parts of the world are also included. Taxonomic revisions are supported by phylogenies based on 18S rRNA, 28S rRNA and COI mtDNA of freshwater Chaetonotidae from several genera and inferred from Bayesian and maximum likelihood approaches. Heterolepidoderma ocellatum f. sphagnophilum is raised to species level, becoming H. acidophilum n. sp. Moreover, genetic data based on COI indicates high variation between two morphologically very similar groups of Lepidodermella squamata. The extent of cryptic speciation in L. zelinkai appears low. Based on the phylogenetic hypothesis presented in this paper the new species, Lepidodermella intermedia n. sp., from northernSweden is also described. The phylogenetic hypothesis generated show that Chaetonotidae is a non-monophyletic group.  

  • 25.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    One new species and records of Ichthydium Ehrenberg, 1830 (Gastrotricha: Chaetonotida) from Sweden with a key to the genus2009Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 2278, s. 26-46Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The freshwater gastrotrich fauna of Sweden is poorly known. Only seven species of freshwater gastrotrichs have been reported so far. This paper is the first in a series of contributions about the Swedish freshwater gastrotrich fauna. Here we describe one new species, Ichthydium skandicum n. sp., from Jämtland, northern Sweden. The new species falls within the boundary of the subgenus Forficulichthys and is morphologically closest to Ichthydium tanytrichum from which it can be differentiated based on the presence of four pairs of dorsal, keeled scales in the posterior trunk region. Moreover, we provide morphometric data for three additional Ichthydium species: I. diacanthum, I. squamigerum and I. tanytrichum, Italian species all of which are reported for the first time outside Italy. Considering the accompanying fauna, a total of thirteen freshwater Gastrotricha are reported for the first time from Sweden. Finally we present a dichotomous key for Ichthydium along with distributional data of the species considered.

  • 26.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för evertebratzoologi.
    Todaro, M. Antonio
    Jondelius, Ulf
    Naturhistoriska riksmuseet, enheten för evertebratzoologi.
    One new species and records of Ichthydium Ehrenberg, 1830 (Gastrotricha: Chaetonotida) from Sweden with a key to the genus2009Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, nr 2278, s. 26-46Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The freshwater gastrotrich fauna of Sweden is poorly known. Only seven species of freshwater gastrotrichs have been reported so far. This paper is the first in a series of contributions about the Swedish freshwater gastrotrich fauna. Here we describe one new species, Ichthydium skandicum n. sp., from Jamtland, northern Sweden. The new species falls within the boundary of the subgenus Forficulichthys and is morphologically closest to Ichthydium tanytrichum from which it can be differentiated based on the presence of four pairs of dorsal, keeled scales in the posterior trunk region. Moreover, we provide morphometric data for three additional Ichthydium species: I. diacanthum, I. squamigerum and I. tanytrichum, Italian species all of which are reported for the first time outside Italy. Considering the accompanying fauna, a total of thirteen freshwater Gastrotricha are reported for the first time from Sweden. Finally we present a dichotomous key for Ichthydium along with distributional data of the species considered.

  • 27.
    Kånneby, Tobias
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, M. Antonio
    Department of Biology, University of Modena and Reggio Emilia, Modena, Italy.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Phylogeny of Chaetonotidae and other Paucitubulatina (Gastrotricha: Chaetonotida) and the colonization of aquatic ecosystems2013Ingår i: Zoologica Scripta, ISSN 0300-3256, E-ISSN 1463-6409, Vol. 42, nr 1, s. 88-105Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Chaetonotidae is the largest family within Gastrotricha with almost 400 nominal species represented in both freshwater and marine habitats. The group is probably non-monophyletic and suffers from a troubled taxonomy. Current classification is to a great extent based on shape and distribution of cuticular structures, characters that are highly variable. We present the most densely sampled molecular study so far where 17 of the 31 genera belonging to Chaetonotida are represented. Bayesian and maximum likelihood approaches based on 18S rDNA, 28S rDNA and COI mtDNA are used to reconstruct relationships within Chaetonotidae. The use of cuticular structures for supra-specific classification within the group is evaluated and the question of dispersal between marine and freshwater habitats is addressed. Moreover, the subgeneric classification of Chaetonotus is tested in a phylogenetic context. Our results show high support for a clade containing Dasydytidae nested within Chaetonotidae. Within this clade, only three genera are monophyletic following current classification. Genera containing both marine and freshwater species never form monophyletic clades and group with other species according to habitat. Marine members of Aspidiophorus appear to be the sister group of all other Chaetonotidae and Dasydytidae, indicating a marine origin of the clade. Halichaetonotus and marine Heterolepidoderma form a monophyletic group in a sister group relationship to freshwater species, pointing towards a secondary invasion of marine environments of these taxa. Our study highlights the problems of current classification based on cuticular structures, characters that show homoplasy for deeper relationships.

  • 28.
    Kånneby, Tobias
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning.
    Todaro, M. Antonio
    Jondelius, Ulf
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning.
    Phylogeny of Chaetonotidae (Gastrotricha) inferred from nuclear and mitochondrial genesManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    Chaetonotidae is the largest family within Gastrotricha with almost 400 nominal species, represented in both freshwater and marine habitats. The group is probably non-monophyletic and suffers from a troubled taxonomy. Current classification is to a great extent based on shape and distribution of cuticular structures, characters that are highly variable. We present the most densely sampled molecular study so far where 17 out of 31 genera belonging to Chaetonotida are represented. Bayesian and maximum likelihood approaches based on 18S rDNA, 28S rDNA and COI mtDNA are used to reconstruct relationships within Chaetonotidae. The use of cuticular structures for supra-specific classification within the group is evaluated and the question of dispersal between marine and freshwater habitats is addressed. Moreover the subgeneric classification of Chaetonotus is tested in a phylogenetic context. Our results show high support for a clade containing Dasydytidae nested within Chaetonotidae. Within this clade only 3 genera are monophyletic following current classification. Genera containing both marine and freshwater species never form monophyletic clades and group with other species according to habitat. Marine members of Aspidiophorus appear to be the sister group of all other Chaetonotidae and Dasydytidae, indicating a marine origin of the clade. Halichaetonotus and marine Heterolepidoderma form a monophyletic group in a sister group relationship to freshwater species, pointing towards a secondary invasion to marine environments of these taxa. Our study shows the problems of current classification based on cuticular structures, characters that show homoplasy for deeper relationships.

  • 29.
    Larsson, Karolina
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik.
    Ahmadzadeh, Afzaneh
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik.
    Jondelius, Ulf
    DNA taxonomy of Swedish Catenulida (Platyhelminthes) and a phylogenetic framework for catenulid classification2008Ingår i: Organisms Diversity & Evolution, ISSN 1439-6092, E-ISSN 1618-1077, Vol. 8, nr 5, s. 399-412Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Specimens of Catenulida were collected at 34 localities in Sweden. We used 18S rDNA. 28S rDNA, ITS-5.8S. and cytochrome oxidase I (COI) nucleotide sequences to infer phylogeny from parsimony jackknifing and Bayesian analysis. Our dataset contained 74 ingroup terminals and 5111 characters. The results show it basal split between it clade consisting of the marine Retronectidae + the limnic Catenulidae. and it second clade consisting, of the limnic Stenostomidae. The hypothesis of the marine Retronectidae as the Sister group of the limnic Catenulida is rejected. The recently introduced genus Anokkostenostomum Norena, Damborenea & Brusa, 2005 results its non-monophyletic, and Suomina Marcus. 1945 its it group inside Catenula Duges, 1832. Therefore, we propose to render Anokkostenostomum a new junior synonym of Stenostomum Schmidt, 1848. and Suomina it new junior synonym of Catenula. Consequently, the new combinations Catenula evelinae (Marcus, 1945), Catenula sawayai (Marcus. 1945), and Catenula turgida (Zacharias. 1902) are proposed. and 14 species are returned to their original genus, Stenostomum. The molecular phylogenetic hypothesis is used to identify and discriminate catenulid species. In Our material. we found 12 species of Catenulida new to Sweden, and four Species new to science. all of which are distinguishable by morphological characters.

  • 30.
    Larsson, Karolina
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Jondelius, Ulf
    Phylogeny of Catenulida and support for Platyhelminthes2008Ingår i: Organisms Diversity & Evolution, ISSN 1439-6092, E-ISSN 1618-1077, Vol. 8, nr 5, s. 378-387Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Molecular studies have shown that Platyhelminthes is polyphyletic, placing Rhabditophora within Lophotrochozoa, whereas Acoela and Nemertodermatida are separate early bilaterian branches. However, there has been little evidence to support the position of Catenulida, a group that was traditionally classified within Platyhelminthes. In Ehlers' pioneering cladistic system of the Platyhelminthes they were placed as the earliest clade. Other morphologists have considered the Catenulida as an early bilaterian clade separate from Rhabditophora, a position that was supported in an early molecular study. Subsequent molecular phylogenetic studies, which placed Catenulida as the sister group of Rhabditophora with no or low branch support, included 18S rDNA data from only one or two catenulid species. The aims of the present study were (1) to test the putative sister-group relationship of Catenulida and Rhabditophora by improving the taxon sampling of molecular data spanning a larger part of catenulid taxonomic diversity and (2) to provide a phylogenetic framework for the systematization of Catenulida. Twelve catenulid species were sampled around Sweden. Both the 18S rDNA gene and the 28S rDNA gene were sequenced and analysed in a Metazoa-wide data set within parsimony and Bayesian frameworks. The results unambiguously support Catenulida as the sister group of Rhabditophora within Lophotrochozoa. Parsimony-based inferences about the common ancestor of Catenulida and Rhabditophora are presented. A definition of the name Platyhelminthes is suggested.

  • 31.
    Leasi, Francesca
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi. Department of Biology, Geology and Environmental Science, University of Tennessee at Chattanooga,.
    Sevigny, Joseph
    Hubbard Center for Genome Studies, Department of Molecular, Cellular, and Biomedical Sciences, University of New Hampshire.
    Laflamme, Eric
    Department of Mathematics, Plymouth State University.
    Artois, Tom
    Centre for Environmental Sciences, Hasselt University.
    Curini-Galletti, Marco
    Dipartimento di Medicina Veterinaria, University of Sassari,.
    Navarrete, Alberto
    Departmento de Sistemática y Ecología Acuática, El Colegio de la Frontera Sur, Unidad Chetumal.
    Di Domenico, Maikon
    Centro de Estudos do Mar, Universidade Federal do Paraná.
    Goetz, Freya
    Department of Invertebrate Zoology, Smithsonian National Museum of Natural History.
    Hall, Jeffrey
    Hubbard Center for Genome Studies, Department of Molecular, Cellular, and Biomedical Sciences, University of New Hampshire.
    Hochberg, Rick
    Department of Biological Science, University of Massachusetts Lowell.
    Jörger, Katharina
    Department of Biology, Ludwig-Maximilians–University of Munich.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Todaro, Antonio
    Department of Life Sciences, University of Modena & Reggio Emilia.
    Wirshing, Herman
    Department of Invertebrate Zoology, Smithsonian National Museum of Natural History.
    Norenburg, Jonathan
    Department of Invertebrate Zoology, Smithsonian National Museum of Natural History.
    Thomas, Kelley
    Hubbard Center for Genome Studies, Department of Molecular, Cellular, and Biomedical Sciences, University of New Hampshire.
    Biodiversity estimates and ecological interpretations of meiofaunal communities are biased by the taxonomic approach2018Ingår i: Communications Biology, ISSN ISSN 2399-3642, Vol. 112Artikel i tidskrift (Refereegranskat)
    Ladda ner fulltext (pdf)
    fulltext
  • 32.
    Martin-Duran, José
    et al.
    University of Bergen.
    Pang, Kevin
    University of Bergen.
    Børve, Aina
    University of Bergen.
    Semmler, Henrike
    Natural History Museum of Denmark.
    Furu, Anlaug
    University of Bergen.
    Cannon, Johanna
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hejnol, Andreas
    University of Bergen.
    Convergent evolution of bilaterian nerve cords2018Ingår i: Nature, ISSN 1476-4687, Vol. 553, artikel-id 25030Artikel i tidskrift (Refereegranskat)
  • 33.
    Meyer-Wachsmuth, Inga
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning. Swedish Museum of Natural History, Sweden.
    Curini Galletti, Marco
    Jondelius, Ulf
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning. Swedish Museum of Natural History, Sweden.
    Hyper-Cryptic Marine Meiofauna: Species Complexes in Nemertodermatida2014Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 9, nr 9, artikel-id e107688Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nemertodermatida are microscopically small, benthic marine worms. Specimens of two nominal species, Sterreria psammicola and Nemertinoides elongatus from 33 locations worldwide were sequenced for three molecular markers. Species delimitation and validation was done using gene trees, haplotype networks and multilocus Bayesian analysis. We found 20 supported species of which nine: Nemertinoides glandulosum n.sp., N. wolfgangi n.sp., Sterreria boucheti n.sp., S. lundini n.sp., S. martindalei n.sp., S. monolithes n.sp., S. papuensis n.sp., S. variabilis n.sp. and S. ylvae n.sp., are described including nucleotide-based diagnoses. The distribution patterns indicate transoceanic dispersal in some of the species. Sympatric species were found in many cases. The high level of cryptic diversity in this meiofauna group implies that marine diversity may be higher than previously estimated. 

    Ladda ner fulltext (pdf)
    Hyper-Cryptic Marine Meiofauna
  • 34.
    Meyer-Wachsmuth, Inga
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning. Naturhistoriska riksmuseet, Enheten för zoologi; Swedish Museum of Natural History, Department of Zoology.
    Jondelius, Ulf
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning. Naturhistoriska riksmuseet, Enheten för zoologi; Swedish Museum of Natural History, Department of Zoology.
    A multigene molecular assessment reveals deep divergence in the phylogeny of NemertodermatidaManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    Here we present a comprehensive phylogeny of Nemertodermatida, a taxon of microscopic marine worms, based for the first on molecular marker with consideration of morphological characters. Our dataset comprises three nuclear genes and most nominal and putative species including recently described cryptic species; only species of the genus Ascoparia could not be obtained. We show that the two families of Nemertodermatida, Ascopariidae and Nemertodermatidae, are retrieved as separate clusters, although not in all analyses as sister groups. We also validate sequences published before 2013 against our dataset; some sequences are shown to be chimeric and have falsified prior hypotheses about nemertodermatid phylogeny, other sequences should be assigned new names. We also show that the genus Nemertoderma needs revision. 

  • 35. Meyer-Wachsmuth, Inga
    et al.
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Interrelationships of Nemertodermatida2015Ingår i: Organisms Diversity & Evolution, ISSN 1439-6092, E-ISSN 1618-1077Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The phylogeny of Nemertodermatida, a group of microscopic marine worms, was analysed using nucleotide sequences from the ribosomal LSU and SSU genes and the protein coding Histone 3 gene. All currently known species except Ascoparia neglecta and A. secunda were included in the study in addition to several yet undescribed species. Ascopariidae and Nemertodermatidae, are retrieved as separate clades, although not in all analyses as sister groups. Non-monophyly of Nemertodermatida was rejected by the Approximately Unbiased test. Nucleotide sequences deposited in Genbank before 2013 as nemertodermatid were validated against our dataset; some of them are shown to be chimeric implying falsification of prior hypotheses about nemertodermatid phylogeny: other sequences should be assigned new names. We also show that the genus Nemertoderma needs revision. 

    Ladda ner fulltext (pdf)
    Interrelationships
  • 36.
    Meyer-Wachsmuth, Inga
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden; Biology Centre of the Czech Academy of Sciences, Czech Republic.
    Jondelius, Ulf
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden.
    Interrelationships of Nemertodermatida2016Ingår i: Organisms Diversity & Evolution, ISSN 1439-6092, E-ISSN 1618-1077, Vol. 16, nr 1, s. 73-84Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nemertodermatida is a small taxon of microscopic marine worms, which were originally classified within Platyhelminthes. Today they are hypothesized to be either an early bilaterian lineage or the sister group to Ambulacraria within Deuterostomia. These two hypotheses indicate widely diverging evolutionary histories in this largely neglected group. Here, we analyse the phylogeny of Nemertodermatida using nucleotide sequences from the ribosomal LSU and SSU genes and the protein coding Histone 3 gene. All currently known species except Ascoparia neglecta and Ascoparia secunda were included in the study in addition to several yet undescribed species. Ascopariidae and Nemertodermatidae are retrieved as separate clades, although not in all analyses as sister groups. Non-monophyly of Nemertodermatida was rejected by the Approximately Unbiased test. Nemertodermatid nucleotide sequences deposited in Genbank before 2013 were validated against our dataset; some of them are shown to be chimeric implying falsification of prior hypotheses about nemertodermatid phylogeny: other sequences should be assigned new names. We also show that the genus Nemertoderma needs revision.

  • 37.
    Meyer-Wachsmuth, Inga
    et al.
    Department of Invertebrate Zoology, Swedish Museum of Natural History.
    Raikova, Olga I.
    Russian Academy of Sciences.
    Jondelius, Ulf
    Department of Invertebrate Zoology, Swedish Museum of Natural History.
    The muscular system of Nemertoderma westbladi and Meara stichopi (Nemertodermatida, Acoelomorpha)2013Ingår i: Zoomorphology, ISSN 0720-213X, E-ISSN 1432-234X, Vol. 132, nr 3, s. 239-252Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nemertodermatida is a small taxon of marine worm-like animals; its position in the tree of life is highly contested The musculature of Nemertoderma westbladi and Meara stichopi is studied here in detail using fluorescent phalloidin and confocal microscopy.

    In both species the musculature is composed of an outer layer of circular and an inner layer of longitudinal musculature, diagonal muscles form a distinct layer in N westbladi but in M. stichopi these fibres connect to both other layers. The supraterminally opening male pore and antrum are formed by invagination of the whole body-wall in both species and the seminal vesicle is lined by a thin net of musculature only in full male maturity. Modifications of the ventral body-wall adjacent to the mouth are small and transient in N. westbladi including no extra musculature whereas it consists of additional strong U-shaped musculature in M. stichopi. Myogenesis in N. westbladi is not finished in hatchlings and will be completed dorsally in juvenile specimens and ventrally in male mature ones, after the loss of the mouth.

    Musculature between the two species differs considerably and might give insights into the internal relationships of Nemertodermatida and might prove to be useful in studies investigating their phylogenetic position. More data of other species and developmental changes are needed.

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    Meyer-Wachsmuth et al. 2013
  • 38. Meyer-Wachsmuth, Inga
    et al.
    Raikova, Olga
    Jondelius, Ulf
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The plastic nervous system of Nemertodermatida2015Ingår i: Organisms Diversity & Evolution, ISSN 1439-6092, E-ISSN 1618-1077Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nemertodermatida are microscopic marine worms likely to be the sister-group to acoels, forming with them the earliest extant branch of bilaterian animals, although their phylogenetic position is debated. The nervous system of Flagellophora cf. apelti, Sterreria spp. and Nemertoderma cf. westbladi has been investigated by immunohistochemistry and confocal microscopy using anti-tubulin, anti-5-HT and anti-FMRFamide antibodies. The nervous system of Flagellophora cf. apelti is composed of a large neuropile and a loose brain at the level of the statocysts with several nerve fibres surrounding them and innervating the broom organ. Sterreria spp. shows a commissural-like brain and several neurite bundles going frontad and caudad from this. At the level of the statocysts there is also a thicker aggregation of immunoreactive fibres. The nervous system of N. cf. westbladi consists of a nerve ring lying outside the body wall musculature at the level of the statocyst and a pair of ventro-lateral neurite bundles, from which extend thinner fibres innervating the ventral side of the animal. Numerous bottle-shaped glands were observed, innervated by fibres starting both from the brain and the neurite bundles. The nervous system of the nemertodermatids studied to-date displays no common pattern, instead there is considerable plasticity in the general morphology of the nervous system. 

    In addition, the musculature of Sterreria spp. has been studied by phalloidin staining. It shows diagonal muscles in the anterior quarter of the body and a simple orthogonal grid in the posterior three quarters, being simpler than that of the other nemertodermatids. High-resolution differential interference contrast microscopy permitted to better visualise some morphological characters of the species studied, such as statocysts, sperm and glands and, in combination with anti-tubulin staining, describe in detail the broom organ in Flagellophora cf. apelti. Finally, we note an apparent absence of innervation of the gut in Nemertodermatida similar to the condition in Xenoturbella.

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    fulltext
  • 39. Nilsson, Karin Sara
    et al.
    Wallberg, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Systematisk biologi.
    Jondelius, Ulf
    New species of Acoela from the Mediterranean, the Red Sea, and the South Pacific2011Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 2867, nr 1, s. 1-31Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Eight new species of Acoela are reported including the first Acoela recorded from New Caledonia and the first acoel described from volcanic carbon dioxide vents. Pharyngia furva gen. et sp.nov. (Isodiametridae) and Philactinoposthia brevis sp.nov. (Actinoposthiidae) from the Red Sea; Childia curinii sp.nov. (Childiidae), Philactinoposthia ischiae sp.nov. and Philactinoposthia multipunctata sp.nov. from the Mediterranean; Philactinoposthia novaecaledoniae sp.nov., Childia aculifera sp.nov. and Solenofilomorpha justinei sp.nov. (Solenofilomorphidae) from the South Pacific are described. Nucleotide sequences for the nuclear ribosomal 18S rRNA, 28S rRNA and the mitochondrial COI genes were determined for the new species and used in a Bayesian molecular phylogenetic analysis.

  • 40. Norén, Michael
    et al.
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Phylogeny of the Prolecithophora (Platyhelminthes) inferred from 18S rDNA sequences1999Ingår i: Cladistics, Vol. 15, s. 103-112Artikel i tidskrift (Refereegranskat)
  • 41. Norén, Michael
    et al.
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    The phylogenetic position of the Prolecithophora (Rhabditophora, 'Platyhelminthes')2002Ingår i: Zoologica Scripta, Vol. 31, s. 403-414Artikel i tidskrift (Refereegranskat)
  • 42.
    Raikova, Olga I.
    et al.
    Zoological Institute of the Russian Academy of Sciences, St.Petersburg, Russia; Chair of Invertebrate Zoology, Saint-Petersburg State University, St.Petersburg, Russia .
    Meyer-Wachsmuth, Inga
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning. Naturhistoriska riksmuseet, Enheten för zoologi; Swedish Museum of Natural History, Department of Zoology.
    Jondelius, Ulf
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen, Avdelningen för zoologisk systematik och evolutionsforskning. Naturhistoriska riksmuseet, Enheten för zoologi; Swedish Museum of Natural History, Department of Zoology.
    Nervous system and morphology of three species of Nemertodermatida (Acoelomorpha) as revealed by immunostainings, phalloidin staining, confocal and differential contrast microscopyManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    Nemertodermatida are microscopic marine worms likely to be the sister-group to acoels and the earliest extant bilaterian animals. The nervous system of Flagellophora apelti, Sterreria sp. and Nemertoderma westbladi has been investigated by immunohistochemistry and confocal microscopy using anti-tubulin, anti-5-HT and anti-FMFRamide antibodies as well as by phalloidin staining.

    The nervous system of Flagellophora apelti is composed of a large brain neuropile at the level of the statocysts with several fibres surrounding it and innervating the broom organ. Sterreria sp. shows a commissural-like brain and several nerve cords going frontad and caudad from this. At the level of the statocysts there is also a thicker aggregation of IR fibres. The nervous system of N. westbladi consists of a nerve ring lying outside the body wall musculature at the level of the statocyst and a pair of ventro-lateral nerve cords, from which extend numerous fibres innervating the ventral side of the animal. Numerous bottle-shaped glands were observed, innervated by fibres starting both from the brain and the cords. Those nemertodermatids studied to-date display no common nervous system pattern. This study demonstrates that the nemertodermatid nervous system possesses a number of plesiomorphic features and appears more primitive than the nervous system in other worms, except Xenoturbellida. The musculature of Sterreria sp., as revealed by phalloidin-TRITC staining, shows diagonal muscles in the anterior quarter of the body and a simple orthogonal grid in the posterior three quarters. It is more primitive than that of the other nemertodermatids. High-resolution differential contrast microscopy permitted to better visualise some morphological characters such as statocysts, sperm and glands. 

  • 43. Raikova, Olga I.
    et al.
    Meyer-Wachsmuth, Inga
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden; Biology Centre of the Czech Academy of Sciences, Czech Republic.
    Jondelius, Ulf
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden.
    The plastic nervous system of Nemertodermatida2016Ingår i: Organisms Diversity & Evolution, ISSN 1439-6092, E-ISSN 1618-1077, Vol. 16, nr 1, s. 85-104Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nemertodermatida are microscopic marine worms likely to be the sister group to acoels, forming with them the earliest extant branch of bilaterian animals, although their phylogenetic position is debated. The nervous system of Flagellophora cf. apelti, Sterreria spp. and Nemertoderma cf. westbladi has been investigated by immunohistochemistry and confocal microscopy using anti-tubulin, anti-5-HT and anti-FMRFamide antibodies. The nervous system of F. cf. apelti is composed of a large neuropile and a loose brain at the level of the statocysts with several nerve fibres surrounding them and innervating the broom organ. Sterreria spp. shows a commissural-like brain and several neurite bundles going frontad and caudad from this. At the level of the statocysts there is also a thicker aggregation of immunoreactive fibres. The nervous system of N. cf. westbladi consists of a nerve ring lying outside the body wall musculature at the level of the statocyst and a pair of ventro-lateral neurite bundles, from which extend thinner fibres innervating the ventral side of the animal. Numerous bottle-shaped glands were observed, innervated by fibres starting both from the brain and the neurite bundles. The nervous system of the nemertodermatids studied to date displays no common pattern; instead, there is considerable plasticity in the general morphology of the nervous system. In addition, the musculature of Sterreria spp. has been studied by phalloidin staining. It shows diagonal muscles in the anterior quarter of the body and a simple orthogonal grid in the posterior three quarters, being simpler than that of the other nemertodermatids. High-resolution differential interference contrast microscopy permitted to better visualize some morphological characters of the species studied, such as statocysts, sperm and glands and, in combination with anti-tubulin staining, describe in detail the broom organ in F. cf. apelti. Finally, we note an apparent absence of innervation of the gut in Nemertodermatida similar to the condition in Xenoturbella.

  • 44.
    Raikova, Olga I.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Reuter, Maria
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Gustafsson, Margaretha K. S.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Maule, Aaron G.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Halton, David W.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi. Systematic Zoology.
    Basiepidermal nervous system in Nemertoderma westbladi (Nemertodermatida): GYIRFamide immunoreactivity2004Ingår i: Zoology, Vol. 107, s. 75-86Artikel i tidskrift (Refereegranskat)
  • 45.
    Raikova, Olga I.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Reuter, Maria
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Gustafsson, Margaretha K. S.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Maule, Aaron G.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Halton, David W.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Institutionen för evolution, genomik och systematik, Systematisk zoologi. Systematic Zoology.
    Evolution of the nervous system in Paraphanostoma (Acoela)2004Ingår i: Zoologica Scripta, Vol. 33, s. 71-88Artikel i tidskrift (Refereegranskat)
  • 46. Raikova, Olga I.
    et al.
    Reuter, Maria
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Gustafsson, Margaretha K. S.
    An immunocytochemical and ultrastructural study of the nervous and muscular systems of Xenoturbella westbladi (Bilateria inc. sed.)2000Ingår i: Zoomorphology, Vol. 120, s. 107-118Artikel i tidskrift (Refereegranskat)
  • 47. Raikova, Olga I.
    et al.
    Reuter, Maria
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Gustafsson, Margaretha K. S.
    The brain of the Nemertodermatida (Platyhelminthes) as revealed by anti-5HT and anti-FMRFamide immunostainings2000Ingår i: Tissue & Cell, Vol. 32, s. 358-365Artikel i tidskrift (Refereegranskat)
  • 48.
    Raikova, Olga
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Tekle, Yonas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Reuter, Maria
    Gustafsson, Margaretha
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk zoologi.
    Copulatory organ musculature in Childia (Acoela) as revealed by phalloidin fluorescence and confocal microscopy2006Ingår i: Tissue & Cell, ISSN 0040-8166, E-ISSN 1532-3072, Vol. 38, nr 4, s. 219-232Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Copulatory organs of eight species of the monophyletic taxon Childia were investigated in detail, using phalloidin fluorescence method and confocal microscopy. Childia species were shown to have one, two or several tubular stylets, conical to cylindrical in shape, composed of few to numerous needles. The musculature varied greatly, from the absence of seminal vesicle to extensively developed seminal vesicles with several additional types of specialized muscles. Ten copulatory organ characters were coded and mapped on the total evidence tree. The data obtained permitted to follow the evolution of the Childia stylet and to demonstrate that the structure of the stylet apparatus is. largely consistent with the phylogeny of the group (CI = 0.75). Possible function of different muscle specializations was discussed.

  • 49. Reuter, Maria
    et al.
    Raikova, Olga I.
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Gustafsson, Margaretha K. S.
    Maule, Aaron G.
    Halton, David W.
    Organisation of the nervous system in the Acoela: An immunocytochemical study2001Ingår i: Tissue & Cell, Vol. 33, s. 119-128Artikel i tidskrift (Refereegranskat)
  • 50. Ruiz-Trillo, Iñaki
    et al.
    Paps, Jordi
    Loukota, Mercè
    Ribera, Carles
    Jondelius, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Teknisk-naturvetenskapliga fakulteten, Biologiska sektionen, Institutionen för evolutionsbiologi.
    Baguñà, Jaume
    Riutort, Marta
    A phylogenetic analysis of myosin heavy chain type II sequences corroborates that Acoela and Nemertodermatida are basal bilaterians2002Ingår i: Proc. Natl. Acad. Sci. USA, Vol. 99, s. 11246-11251Artikel i tidskrift (Refereegranskat)
12 1 - 50 av 62
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