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  • 1.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Adedidran, Funmilola
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    A draft transcriptome of a parasite Neocamacolaimus parasiticus (Camacolaimidae, Plectida)2021Ingår i: Journal of Nematology, E-ISSN 0022-300X, artikel-id e2021Artikel i tidskrift (Refereegranskat)
  • 2.
    Ahmed, Mohammed
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden.
    Adedidran, Funmilola
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen.
    Holovachov, Oleksandr
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden.
    A draft transcriptome of a parasite Neocamacolaimus parasiticus (Camacolaimidae, Plectida)2021Ingår i: Journal of nematology, ISSN 0022-300X, Vol. 53, artikel-id e2021-40Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Camacolaimidae is a clade of nematodes that include both freeliving epistrate feeding forms and parasites of marine protozoans and invertebrates. Neocamacolaimus parasiticus is a parasite of marine polychaete worms. Given its phylogenetic affinities to free-living species, Neocamacolaimus can be a reference for research of the origin of parasitism in an aquatic environment. Here, we present a draft transcriptome obtained from a single post-parasitic juvenile individual of this species. The final assembly consists of 19,180 protein coding sequences (including isoforms) with the following BUSCO scores for Nematoda: 65.38% complete, 9.06% partial, and 25.56% missing, and for Metazoa: 79.45% complete, 3.17% partial, and 17.38% missing.

  • 3.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Boström, Sven
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Revision of the genus Cobbionema Filipjev, 1922 (Nematoda, Chromadorida, Selachinematidae)2020Ingår i: European journal of taxonomy, E-ISSN 2118-9773, Vol. 702, s. 1-34Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper reports on the genus Cobbionema Filipjev, 1922 in Sweden with the description of four species and a revision of the genus. Cobbionema acrocerca Filipjev, 1922 is relatively small in size, with a tail that has a conical proximal and a digitate distal section. Cobbionema cylindrolaimoides Schuurmans Stekhoven, 1950 is similar to C. acrocerca in most characters except having a larger body size and heavily cuticularized mandibles. Cobbionema brevispicula sp. nov. is characterised by short spicules and a conoid tail. Cobbionema acuminata sp. nov. is characterised by a long two-part spicule, a conical tail and three (one mid dorsal and two ventrosublateral) sharply pointed tines in the anterior chamber of the stoma that are located more anterior than in all the other species. We also present a molecular phylogeny of the family based on the nearly full-length 18S and the D2-D3 expansion segment of the 28S rRNA genes. Maximum Likelihood and Bayesian trees inferred from both genes strongly support a clade that included Cobbionema, Demonema Cobb, 1894 and Halichoanolaimus de Man, 1888 and another clade with Gammanema Cobb, 1920 and Latronema Wieser, 1954 nested together. None of the trees supported the monophyly of the subfamilies Choniolaiminae and Selachinematinae.

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  • 4.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Boström, Sven
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Rik rundmaskfauna i Store Mosse nationalpark hittades med DNA-metastreckkodning2023Ingår i: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 118, nr 2, artikel-id 24-33Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
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  • 5.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Description of a new marine predatory nematode Latronema dyngi sp. nov. (Nematoda, Chromadorida, Selachinematidae) from the west coast of Sweden and an updated phylogeny of Chromadoria2020Ingår i: Marine Biodiversity, ISSN 1867-1616, E-ISSN 1867-1624, Vol. 50, nr 113, s. 1-11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A new nematode species, Latronema dyngi sp. nov., is described from Skagerrak off the west coast of Sweden with the type locality near Dyngö island. Latronema dyngi sp. nov. is characterized by multispiral amphideal fovea with circular outline, 0.2– 0.3 corresponding body diameters wide in males and 0.1–0.2 corresponding body diameters wide in females, 12 cuticular longitudinal ridges and 18–27 precloacal supplements in males. Latronema dyngi sp. nov. most closely resembles L. orcinum in terms of body length; demanian ratios a, b, c and c′; number of amphid turns in males; and the ratio of spicule length to cloacal body diameter. The two species can be differentiated by the number longitudinal ridges on the cuticle (12 for Latronema dyngi sp. nov. vs 20–22 for L. orcinum) and spicule length (65–78 μm for L. dyngi vs 60 for L. orcinum) and shape (weakly arcuate for L. dyngi sp. nov. vs strongly arcuate for L. orcinum). We also performed a maximum likelihood phylogenetic analysis on over 250 nematodes of the subclass Chromadoria based on their nearly full-length 18S rDNA sequences. In agreement with previous studies, our analysis supported Selachinematidae as a monophyletic group and placed Richtersia Steiner, 1916 within Desmodoridae Filipjev, 1922 or just outside of the main Desmodorida clade with the latter placement not well supported.

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  • 6.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Twenty Years after De Ley and Blaxter—How Far Did We Progress in Understanding the Phylogeny of the Phylum Nematoda?2021Ingår i: Animals, E-ISSN 2076-2615, Vol. 11, nr 12, s. 3479-3479Artikel i tidskrift (Refereegranskat)
  • 7. Ahmed, Mohammed
    et al.
    Roberts, Nickellaus G.
    Adediran, Funmilola
    Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen.
    Smythe, Ashleigh B.
    Kocot, Kevin M.
    Holovachov, Oleksandr
    Phylogenomic Analysis of the Phylum Nematoda: Conflicts and Congruences With Morphology, 18S rRNA, and Mitogenomes2022Ingår i: Frontiers in Ecology and Evolution, E-ISSN 2296-701X, Vol. 9, artikel-id 769565Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Phylogenetic relationships within many lineages of the phylum Nematoda remain unresolved, despite numerous morphology-based and molecular analyses. We performed several phylogenomic analyses using 286 published genomes and transcriptomes and 19 new transcriptomes by focusing on Trichinellida, Spirurina, Rhabditina, and Tylenchina separately, and by analyzing a selection of species from the whole phylum Nematoda. The phylogeny of Trichinellida supported the division of Trichinella into encapsulated and non-encapsulated species and placed them as sister to Trichuris. The Spirurina subtree supported the clades formed by species from Ascaridomorpha and Spiruromorpha respectively, but did not support Dracunculoidea. The analysis of Tylenchina supported a clade that included all sampled species from Tylenchomorpha and placed it as sister to clades that included sampled species from Cephalobomorpha and Panagrolaimomorpha, supporting the hypothesis that postulates the single origin of the stomatostylet. The Rhabditina subtree placed a clade composed of all sampled species from Diplogastridae as sister to a lineage consisting of paraphyletic Rhabditidae, a single representative of Heterorhabditidae and a clade composed of sampled species belonging to Strongylida. It also strongly supported all suborders within Strongylida. In the phylum-wide analysis, a clade composed of all sampled species belonging to Enoplia were consistently placed as sister to Dorylaimia + Chromadoria. The topology of the Nematoda backbone was consistent with previous studies, including polyphyletic placement of sampled representatives of Monhysterida and Araeolaimida.

  • 8.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Roberts, Nickellaus G.
    Adediran, Funmilola
    Smythe, Ashleigh B.
    Kocot, Kevin M.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Phylogenomic Analysis of the Phylum Nematoda: Conflicts and Congruences With Morphology, 18S rRNA, and Mitogenomes2022Ingår i: Frontiers in Ecology and Evolution, E-ISSN 2296-701X, Vol. 9, artikel-id 769565Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Phylogenetic relationships within many lineages of the phylum Nematoda remainunresolved, despite numerous morphology-based and molecular analyses. Weperformed several phylogenomic analyses using 286 published genomes andtranscriptomes and 19 new transcriptomes by focusing on Trichinellida, Spirurina,Rhabditina, and Tylenchina separately, and by analyzing a selection of species fromthe whole phylum Nematoda. The phylogeny of Trichinellida supported the divisionof Trichinella into encapsulated and non-encapsulated species and placed them assister to Trichuris. The Spirurina subtree supported the clades formed by species fromAscaridomorpha and Spiruromorpha respectively, but did not support Dracunculoidea.The analysis of Tylenchina supported a clade that included all sampled species fromTylenchomorpha and placed it as sister to clades that included sampled speciesfrom Cephalobomorpha and Panagrolaimomorpha, supporting the hypothesis thatpostulates the single origin of the stomatostylet. The Rhabditina subtree placed a cladecomposed of all sampled species from Diplogastridae as sister to a lineage consistingof paraphyletic Rhabditidae, a single representative of Heterorhabditidae and a cladecomposed of sampled species belonging to Strongylida. It also strongly supportedall suborders within Strongylida. In the phylum-wide analysis, a clade composedof all sampled species belonging to Enoplia were consistently placed as sister toDorylaimia + Chromadoria. The topology of the Nematoda backbone was consistentwith previous studies, including polyphyletic placement of sampled representatives ofMonhysterida and Araeolaimida.

  • 9.
    Ahmed, Mohammed
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Slos, Dieter
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Assessing the diversity of nematodes in the Store Mosse National Park (Sweden) using metabarcoding2024Ingår i: Metabarcoding and Metagenomics, E-ISSN 2534-9708, Vol. 8, s. 1-8Artikel i tidskrift (Refereegranskat)
  • 10.
    Balog, Luca Eszter
    et al.
    Eötvös Loránd University, Hungary.
    Ahmed, Mohammed
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Török, Júlia Katalin
    Eötvös Loránd University, Hungary.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi. Department of Zoology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden.
    Redescription of an insect-associated nematode, Reiterina typica (Stefański, 1922) Sudhaus, 2011 (Rhabditida: Rhabditidae) found in scarab grubs in Hungary2023Ingår i: Nematology (Leiden. Print), ISSN 1388-5545, E-ISSN 1568-5411, Vol. 25, nr 6, s. 699-712Artikel i tidskrift (Refereegranskat)
  • 11. Balog, Luca Eszter
    et al.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Török, Julia Katalin
    PREVALENCE AND DISTRIBUTION OF DIFFERENT NATURAL ENEMIES IN THE HARLEQUIN LADYBIRD HARMONIA AXYRIDIS (COLEOPTERA COCCINELLIDAE)2021Ingår i: Redia, E-ISSN 0370-4327, artikel-id General Agricultural and Biological SciencesArtikel i tidskrift (Refereegranskat)
  • 12. Boscaro, Vittorio
    et al.
    Holt, Corey C.
    Van Steenkiste, Niels W. L.
    Herranz, M
    Irwin, Nicholas A. T.
    Àlvarez-Campos, Patricia
    Grzelak, Katarzyna
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Kerbl, A.
    Mathur, V.
    Okamoto, N.
    Piercey, Rebecca S.
    Worsaae, Katrine
    Leander, Brian S.
    Keeling, Patrick J.
    Microbiomes of microscopic marine invertebrates do not reveal signatures of phylosymbiosis2022Ingår i: Nature Microbiology, E-ISSN 2058-5276, Vol. 7, nr 6, s. 810-819Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Animals and microorganisms often establish close ecological relationships. However, much of our knowledge about animal microbiomes comes from two deeply studied groups: vertebrates and arthropods. To understand interactions on a broader scale of diversity, we characterized the bacterial microbiomes of close to 1,000 microscopic marine invertebrates from 21 phyla, spanning most of the remaining tree of metazoans. Samples were collected from five temperate and tropical locations covering three marine habitats (sediment, water column and intertidal macroalgae) and bacterial microbiomes were characterized using 16S ribosomal RNA gene sequencing. Our data show that, despite their size, these animals harbour bacterial communities that differ from those in the surrounding environment. Distantly related but coexisting invertebrates tend to share many of the same bacteria, suggesting that guilds of microorganisms preferentially associated with animals, but not tied to any specific host lineage, are the main drivers of the ecological relationship. Host identity is a minor factor shaping these microbiomes, which do not show the same correlation with host phylogeny, or ‘phylosymbiosis’, observed in many large animals. Hence, the current debate on the varying strength of phylosymbiosis within selected lineages should be reframed to account for the possibility that such a pattern might be the exception rather than the rule.

  • 13.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Ahmed, Mohammed
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Havsbottens mikroskopiska hajar2022Ingår i: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 117, nr 1, s. 44-48Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 14.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Carl Allgén – Svensk zoolog och nematodforskare2020Ingår i: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 115, nr 2, s. 42-45Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 15.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Description  of  a  new  species  of  Paracrobeles  Heyns,  1968  (Nematoda,   Rhabditida, Cephalobidae)  from  Kelso  Dunes,  Mojave  National   Preserve,  California,  USA2015Ingår i: European journal of taxonomy, E-ISSN 2118-9773, Vol. 117, s. 1-11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A new species of Paracrobeles, P. kelsodunensis sp. nov. is described from the Kelso Dunes area, Mojave National Preserve, southern California. Paracrobeles kelsodunensis sp. nov. is particularly characterised by a body length of 469–626 μm in females and 463–569 μm in males; lateral field with four incisures, extending almost to tail terminus; three pairs of asymmetrical lips, separated by U-shaped primary axils with two long guarding processes, each lip usually with four tines along its margin; three long labial probolae, deeply bifurcated, with slender prongs without tines; metastegostom with a strong anteriorly directed dorsal tooth; pharyngeal corpus anteriorly spindle-shaped, posteriorly elongate bulbous with dilated lumen; spermatheca 24–87 μm long; postvulval uterine sac 60–133 μm long; vulva in a sunken area; spicules 33–38 μm long; and male tail with a 5–8 μm long mucro. The generic diagnosis is emended on the basis of recently described species and a key to the species of Paracrobeles is provided.

  • 16.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Description of Cribronema sturhani sp. n. (Nematoda, Rhabditida, Cephalobidae), a second species of a rare genus from Cameroon2019Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 4695, nr 2, s. 175-181Artikel i tidskrift (Refereegranskat)
  • 17.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Description of Drilocephalobus moldavicus Lisetskaya,1968 (Rhabditida: Osstellidae) from Kelso Dunes, Mojave National Reserve, California,USA2018Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 4514, nr 3, s. 438-444Artikel i tidskrift (Refereegranskat)
  • 18.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Descriptions of species of Stegelleta Thorne, 1938 (Nematoda, Rhabditida, Cephalobidae) from California, New Zealand and Senegal, and a revision of the genus2014Ingår i: European journal of taxonomy, E-ISSN 2118-9773, Vol. 87, s. 1-19Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Populations of Stegelleta are described from California, New Zealand and Senegal. An amphimictic population from California is identified as belonging to S. incisa and compared with type specimens from Utah and an amphimictic population from Italy. One population from New Zealand is close to S. incisa but considered to represent a new species, Stegelleta laterocornuta sp. nov. It is particularly characterised by a 379–512 μm long body in females and 365–476 μm in males; cuticle divided into 16 rows of blocks at midbody (excluding lateral field); lateral field with four incisures; three pairs of asymmetrical lips, U-shaped primary axils without guarding processes, each lip asymmetrically rectangular with a smooth margin, only lateral lips have slender acute tines; three labial probolae, bifurcated at half of their length; vulva without flap; spermatheca 17–31 μm long; postuterine sac 7–24 μm long; spicules 21.5–23.5 μm long. Other specimens from New Zealand are identified as belonging to S. tuarua. A parthenogenetic population from Senegal is identified as belonging to S. ophioglossa and compared with type specimens from Mongolia and records of several other populations of S. ophioglossa. The generic diagnosis is emended and a key to the species of Stegelleta is provided.

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  • 19.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Suktorier (Ciliophora – ciliater) som beskrivits av Carl Allgén2023Ingår i: Fauna & flora: en spegling av svensk natur, E-ISSN 0014-8903, Vol. 118, nr 4, s. 48-53Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 20.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The Swedish marine nematologist Carl Allgén (1886–1960): a bio-bibliography and his collection2017Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 4232, nr 4, s. 451-490Artikel i tidskrift (Refereegranskat)
  • 21.
    Boström, Sven
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Variationsrika rundmaskar2020Ingår i: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 115, nr 4, s. 48-53Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 22.
    Bouguerche, Chahinez
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Huston, Daniel C.
    Australian National Insect Collection, National Research Collections Australia, CSIRO, PO Box 1700, Canberra, ACT 2601, Australia.
    Cribb, Thomas H.
    The University of Queensland, School of Biological Sciences, St Lucia, QLD, 4072, Australia.
    Karlsbakk, Egil
    Department of Biological Sciences, University of Bergen, 7803, 5020 Bergen, Norway.
    Ahmed, Mohammed
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Hidden in the fog: morphological and molecular characterisation of Derogenes varicus sensu stricto (Trematoda, Derogenidae) from Sweden and Norway, and redescription of two poorly known Derogenes species2023Ingår i: Parasite, ISSN 1252-607X, E-ISSN 1776-1042, Vol. 30, s. 35-35Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Derogenes varicus (Müller, 1784) is widely reported as a trematode with exceptionally low host specificity and a wide, bipolar distribution. However, several recent studies have suggested that D. varicus represents a species complex and based on molecular evidence, four genetic lineages (labeled as “DV1–4”) have been designated within the D. varicus species complex. This possibility requires improved (ideally molecular) characterisation of specimens from the type-host (Salmo salar) and type-locality (off Denmark). During examination of trematode parasites of fish from Scandinavian and Arctic waters (Sweden and Norway), we found specimens of D. varicus in the stomach of Merlangius merlangus off the coast of Sweden, and in Gadus morhua off the coast of Sweden and Norway; we compared them to D. varicus from the type-host, the Atlantic salmon Salmo salar from Norway, to verify their conspecificity. Newly generated sequences (28S rDNA, ITS2 and cox1) of Scandinavian and Arctic specimens consistent with D. varicus all formed a single clade, DV1. 28S sequences of D. varicus from S. salar from Norway, i.e., close to the Danish type locality, clustered within the DV1 clade along with sequences of D. varicus from various hosts including Limanda limanda, G. morhua and Myoxocephalus scorpius from the White Sea and the Barents Sea (Russia), without any host-related structuring. We thus consider that the lineage DV1 represents D. varicus sensu stricto. Additionally, specimens from M. merlangus had a similar morphology and anatomy to those of D. varicus from L. limanda, G. morhua and M. scorpius from T. Odhner’s collection, supporting the presence of a single species in the DV1 lineage designated herein as D. varicus sensu stricto. We redescribe D. varicus sensu stricto, add new morphological characters and provide morphometric data. We infer that D. varicus types DV2–4 all relate to separate species. We also revise type-specimens of Derogenes minor Looss, 1901 from the A. Looss collection in the Swedish Museum of Natural History and provide redescriptions of it and of the type-species of the genus, Derogenes ruber Lühe, 1900. In light of their morphological distinctiveness relative to D. varicus sensu stricto, we reinstate D. parvus Szidat, 1950 and D. fuhrmanni Mola, 1912.

  • 23.
    Broman, Elias
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Stockholms universitet, Naturvetenskapliga fakulteten, Stockholms universitets Östersjöcentrum.
    Bonaglia, Stefano
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. University of Southern Denmark, Denmark.
    Holovachov, Oleksandr
    Marzocchi, Ugo
    Hall, Per O. J.
    Nascimento, Francisco J. A.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och botanik. Stockholms universitet, Naturvetenskapliga fakulteten, Stockholms universitets Östersjöcentrum.
    Uncovering diversity and metabolic spectrum of animals in dead zone sediments2020Ingår i: Communications biology, E-ISSN 2399-3642, Vol. 3, nr 1, artikel-id 106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ocean deoxygenation driven by global warming and eutrophication is a primary concern for marine life. Resistant animals may be present in dead zone sediments, however there is lack of information on their diversity and metabolism. Here we combined geochemistry, microscopy, and RNA-seq for estimating taxonomy and functionality of micrometazoans along an oxygen gradient in the largest dead zone in the world. Nematodes are metabolically active at oxygen concentrations below 1.8 µmol L−1, and their diversity and community structure are different between low oxygen areas. This is likely due to toxic hydrogen sulfide and its potential to be oxidized by oxygen or nitrate. Zooplankton resting stages dominate the metazoan community, and these populations possibly use cytochrome c oxidase as an oxygen sensor to exit dormancy. Our study sheds light on mechanisms of animal adaptation to extreme environments. These biological resources can be essential for recolonization of dead zones when oxygen conditions improve.

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  • 24.
    Broman, Elias
    et al.
    Stockholm University.
    Bonaglia, Stefano
    Stockholm University.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Marzocchi, Ugo
    Aarhus University.
    Hall, Per O.J.
    University of Gothenburg.
    Nascimento, Francisco J.A.
    Stockholm University.
    Uncovering diversity and metabolic spectrum of animals in dead zone sediments2020Ingår i: Communications Biology, E-ISSN 2399-3642, Vol. 3, s. 1-12, artikel-id 106Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ocean deoxygenation driven by global warming and eutrophication is a primary concern for marine life. Resistant animals may be present in dead zone sediments, however there is lack of information on their diversity and metabolism. Here we combined geochemistry, microscopy, and RNA-seq for estimating taxonomy and functionality of micrometazoans along an oxygen gradient in the largest dead zone in the world. Nematodes are metabolically active at oxygen concentrations below 1.8μmolL−1, and their diversity and community structure are different between low oxygen areas. This is likely due to toxic hydrogen sulfide and its potential to be oxidized by oxygen or nitrate. Zooplankton resting stages dominate the metazoan community, and these populations possibly use cytochrome c oxidase as an oxygen sensor to exit dormancy. Our study sheds light on mechanisms of animal adaptation to extreme environments. These biological resources can be essential for recolonization of dead zones when oxygen conditions improve.

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  • 25.
    Gharahkhani, Azadeh
    et al.
    Tarbiat Modares University.
    Pourjam, Ebrahim
    Tarbiat Modares University.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Pedram, Majid
    Tarbiat Modares University.
    Phylogenetic relationships of Leptolaimus de Man, 1876 (Plectida: Leptolaimidae) with description of two new species from the Persian Gulf, Iran2021Ingår i: Nematology (Leiden. Print), ISSN 1388-5545, E-ISSN 1568-5411, Vol. 23, nr 2, s. 153-169Artikel i tidskrift (Refereegranskat)
  • 26. Gianasi, Bruno L.
    et al.
    Goldsmit, Jesica
    Archambault, Philippe
    McKindsey, Christopher W.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Howland, Kimberly L.
    Biodiversity of macrobenthic nematodes in the intertidal and shallow subtidal zones in the Eastern Canadian Arctic2022Ingår i: Polar Biology, ISSN 0722-4060, E-ISSN 1432-2056Artikel i tidskrift (Refereegranskat)
  • 27. 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)
  • 28.
    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)
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  • 29.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    7.16 Order Plectida Gadea, 19732014Ingår i: Gastrotricha, Cycloneuralia, Gnathifera: Volume 2: Nematoda / [ed] A. Schmidt-Rhaesa, Walter de Gruyter, 2014, s. 487-535Kapitel i bok, del av antologi (Refereegranskat)
  • 30.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    7.7 Order Isolaimiida Cobb, 19202014Ingår i: Gastrotricha, Cycloneuralia and Gnathifera: Volume 2: Nematoda / [ed] A. Schmidt-Rhaesa, Walter de Gruyter, 2014, s. 313-316Kapitel i bok, del av antologi (Refereegranskat)
  • 31.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Tandingan De Ley, Irma
    Mc Donnell, Rory J.
    Alvarado, Salomon
    Paine, Timothy D.
    De Ley, Paul
    Alloionema similis n. sp., a genetically divergent sibling species of A. appendiculatum Schneider, 1859 (Rhabditida: Alloionematidae) from invasive slugs in California, USA2016Ingår i: Systematic Parasitology, ISSN 0165-5752, E-ISSN 1573-5192, Vol. 93, s. 877-898Artikel i tidskrift (Refereegranskat)
  • 32.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Belgopeltula belgica (Vincx & Gourbault, 1992) gen. et comb. nov. and Mudwigglus micramphidium sp. nov. from the west coast of Sweden, and reappraisal of the genus Pseudaraeolaimus Chitwood, 1951 (Nematoda: Araeolaimida: Diplopeltidae)2017Ingår i: European journal of taxonomy, E-ISSN 2118-9773, Vol. 383, s. 1-21Artikel i tidskrift (Refereegranskat)
  • 33.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Campydoroides manautei gen. et sp. nov. from New Caledonia and reappraisal of suborder Campydorina (Nematoda)2019Ingår i: European journal of taxonomy, E-ISSN 2118-9773, Vol. 518, s. 1-23Artikel i tidskrift (Refereegranskat)
  • 34.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Description of Aegialoalaimus bratteni sp. n. from Skagerrak and a review of the genus (Aegialoalaimidae, Nematoda incertae sedis).2015Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 3, s. 1-13, artikel-id e5738Artikel i tidskrift (Refereegranskat)
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  • 35.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Identification keys to genera and species of the suborder Plectina, order Plectida (Nematoda).2016Övrigt (Övrigt vetenskapligt)
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  • 36.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Marina nematoder havets trädgårdsmästare2016Ingår i: Fauna och flora : populär tidskrift för biologi, ISSN 0014-8903, Vol. 111, nr 4, s. 30-34Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 37.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Metabarcoding of marine nematodes – evaluation of reference datasets used in tree-based taxonomy assignment approach2016Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 4, artikel-id e10021Artikel i tidskrift (Refereegranskat)
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  • 38.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Metabarcoding of marine nematodes – evaluation of similarity scores used in alignment-based taxonomy assignment approach2016Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 4, artikel-id e10647Artikel i tidskrift (Refereegranskat)
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  • 39.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Microscopic gardeners of the sea: marine nematodes and their bacterial symbionts2015Ingår i: MicrobeHunter Microscopy Magazine, ISSN 2220-4962, Vol. 50, s. 7-11Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 40.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Nematodes from terrestrial and freshwater habitats in the Arctic2014Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 2, nr e1165Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    We present an updated list of terrestrial and freshwater nematodes from all regions of the Arctic, for which records of properly identified nematode species are available: Svalbard, Jan Mayen, Iceland, Greenland, Nunavut, Northwest territories, Alaska, Lena River estuary, Taymyr and Severnaya Zemlya and Novaya Zemlya. The list includes 391 species belonging to 146 genera, 54 families and 10 orders of the phylum Nematoda.

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  • 41.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    New and known species of the genus Campylaimus Cobb, 1920 (Nematoda: Araeolaimida: Diplopeltidae) from North European marine habitats2019Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 7, artikel-id e46545Artikel i tidskrift (Refereegranskat)
  • 42.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    New and known species of the genus Campylaimus Cobb, 1920 (Nematoda: Araeolaimida: Diplopeltidae) from North European marine habitats2019Ingår i: Biodiversity Data Journal, ISSN 1314-2836, E-ISSN 1314-2828, Vol. 7, artikel-id e46545Artikel i tidskrift (Refereegranskat)
  • 43.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Swedish Plectida (Nematoda). Part 7. Setostephanolaimus tchesunovi sp. n. from the west coast of Sweden2014Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3847, s. 576-582Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A new species of Setostephanolaimus, S. tchesunovi sp. n., is described from bottom sediments collected in the Skagerrak and Gullmarn Fjord off the west coast of Sweden. It is characterised by 1.0–1.3 mm long body, outer labial setae 6.5–8.5 μm long, cephalic setae 9–11 μm long, subcephalic setae 4–6 μm long, transversely-oval amphid, female with monodelphic opisthodelphic reproductive system, male with 6–9 tubular and without alveolar supplements, spicules arcuate and 54–64 μm long, gubernaculum with dorsal apophysis. A tabular compendium and dichotomous identification key to species of the genus Setostephanolaimus are provided.

  • 44.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Swedish Plectida (Nematoda). Part 8. The genus Onchium Cobb, 19202015Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3911, nr 4, s. 521-546Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Four known and one new species of Onchium are described from bottom sediments collected in Skagerrak off the west coast of Sweden. The following known species are redescribed: Onchium ocellatum Cobb, 1920, O. metocellatum Wieser, 1956, O. parocellatum (Allgén, 1940) and O. robustum Gerlach, 1965. Onchium longispiculum sp. n. is characterised by the 1.34–1.77 mm long body, anterior body end without cephalic capsule, anteriormost somatic sensilla located posterior to onchiostyle base, ocelli absent, excretory pore located at basis of lips, onchiostyle uniformly cylindrical, alveolar sup- plements indistinct, tubular supplements absent, spicules arcuate and 44–65 μm long. The new species has a unique set of characters (absence of developed ocelli and very long somewhat asymmetrical spicules) separating it from all other known species of the genus Onchium. The following nomenclatorial changes are proposed: O. conicaudatum (Allgén, 1935) is considered a junior synonym of O. metocellatum; O. conicaudatum apud Wieser, 1951 is considered a synonym of O. minutum Kito, 1981. The diagnosis of the genus Onchium is emended and a tabular compendium and dichotomous iden- tification key to species of the genus Onchium are provided.

  • 45.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Swedish Plectida (Nematoda). Part 9. The genus Leptolaimoides Vitiello, 19712015Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 3955, s. 83-100Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Three known and two new species of Leptolaimoides are described from bottom sediments collected in Skagerrak off the west coast of Sweden. The following known species are redescribed: Leptolaimoides haploopis Jensen, 1978, L. tubulosus Vitiello, 1971 and L. hexatubulosus Hoang Lai-Phu et al., 2009. Leptolaimoides filicaudatus sp. n. is characterised by the 431–543 μm long body; cephalic sensilla papilliform; amphid 23–26 μm long, located 9–10 μm from anterior end; first body pore located 35–37 μm from anterior end; lateral field simple along most of body, areolated on tail, arising 36–40 μm from anterior end; female without supplements, vagina without pars refringens, vulva midventral; male without tubu- lar and without alveolar supplements; spicules arcuate and 16 μm long. Leptolaimoides leptomicron sp. n. is characterised by the 776–847 μm long body; cephalic sensilla papilliform; amphid 15–17 μm long, located 9–13 μm from anterior end; first body pore located 40–46 μm from anterior end; lateral field areolated, arising 26–28 μm from anterior end; female without supplements, vagina without pars refringens, vulva midventral; male with three tubular and without alveolar sup- plements, spicules arcuate and 28–29 μm long. The diagnosis of the genus Leptolaimoides is emended and a tabular com- pendium and dichotomous identification key to species of the genus Leptolaimoides are provided.

  • 46.
    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)
  • 47.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    The nomenclatural status of new nematode nomina proposed in 1993 in the doctoral thesis of Christian Bussau, entitled Taxonomische und ökologische Untersuchungen an Nematoden des Peru-Beckens (Nematoda)2020Ingår i: Bionomina: International Journal of Biological Nomenclature and Terminology, ISSN 1179-7649, E-ISSN 1179-7657, Vol. 19, s. 86-99Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In his doctoral thesis, Christian Bussau published 110 new nematode nomina, including 97 nomina of new species, 11 of new genera and two of new subfamilies. The nomenclatural availability of these nomina has not been generally accepted and is evaluated here. It is determined that the doctoral thesis published by Bussau (1993) satisfies the criteria of publication outlined in Article 8 of the Code, and that all nomenclatural acts published in it satisfy the criteria of availability outlined in Articles 11 and 13 of the Code. The correct authority for all nomina first published in Bussau (1993) is ‘Bussau, 1993’, and not ‘Bussau, 1995’ or ‘Bussau & Vopel, 1999’. All nomenclatural acts published in Bussau (1995) and Bussau & Vopel (1999) are junior objective synonyms of acts published in Bussau (1993), except for Bathynox Bussau & Vopel, 1999. Nox Bussau, 1993 is a junior homonym of Nox Nalbant, 1986, and was provided the available new replacement nomen Bathynox Bussau & Vopel, 1999. The correct authority of Bathynox clavata is ‘(Bussau, 1993)’.

  • 48.
    Holovachov, Oleksandr
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Unseen beauty of flowers – hidden signals or spectacular byproduct?2015Ingår i: Green Letters: Studies in Ecocriticism, ISSN 1468-8417, Vol. 19, s. 329-331Artikel i tidskrift (Refereegranskat)
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  • 49.
    Holovachov, Oleksandr
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Andriy, Zatushevsky
    Ivan Franko National University of Lviv.
    Ihor, Shydlovsky
    Ivan Franko National University of Lviv.
    Whole-Drawer Imaging of Entomological Collections: Benefits, Limitations and Alternative Applications2014Ingår i: Journal of Conservation and Museum Studies, ISSN 2049-4572, E-ISSN 1364-0429, Vol. 12, nr 9, s. 1-13Artikel i tidskrift (Refereegranskat)
  • 50.
    Holovachov, Oleksandr
    et al.
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Bosröm, Sven
    Naturhistoriska riksmuseet, Enheten för zoologi.
    Swedish Plectida (Nematoda). Part 10. The genus Deontolaimus de Man, 18802015Ingår i: Zootaxa, ISSN 1175-5326, E-ISSN 1175-5334, Vol. 4034, s. 1-44Artikel i tidskrift (Refereegranskat)
12 1 - 50 av 77
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