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The cranial endocast of Dipnorhynchus sussmilchi (Sarcopterygii: Dipnoi) and the interrelationships of stem-group lungfishes
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Flinders Univ S Australia, Sch Biol Sci, Adelaide, SA, Australia.;Museum Victoria, Dept Sci, Melbourne, Vic, Australia..
Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland..
Flinders Univ S Australia, Sch Biol Sci, Adelaide, SA, Australia..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
2016 (English)In: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 4, e2539Article in journal (Refereed) Published
Abstract [en]

The first virtual cranial endocast of a lungfish from the Early Devonian, Dipnorhynchus sussmilchi, is described. Dipnorhynchus, only the fourth Devonian lungfish for which a near complete cranial endocast is known, is a key taxon for clarifying primitive character states within the group. A ventrally-expanded telencephalic cavity is present in the endocast of Dipnorhynchus demonstrating that this is the primitive state for "true" Dipnoi. Dipnorhynchus also possesses a utricular recess differentiated from the sacculolagenar pouch like that seen in stratigraphically younger lungfish (Dipterus, Chirodipterus, Rhinodipterus), but absent from the dipnomorph Youngolepis. We do not find separate pineal and para-pineal canals in contrast to a reconstruction from previous authors. We conduct the first phylogenetic analysis of Dipnoi based purely on endocast characters, which supports a basal placement of Dipnorhynchus within the dipnoan stem group, in agreement with recent analyses. Our analysis demonstrates the value of endocast characters for inferring phylogenetic relationships.

Place, publisher, year, edition, pages
2016. Vol. 4, e2539
Keyword [en]
Dipnoi, Endocast, Braincase, Palaeoneurology, Devonian, Dipnorhynchus, Phylogeny, Microtomography, Cladistic analysis
National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-307527DOI: 10.7717/peerj.2539ISI: 000385821100005PubMedID: 27781157OAI: oai:DiVA.org:uu-307527DiVA: diva2:1047463
Funder
Knut and Alice Wallenberg FoundationAustralian Research Council, DP160102460
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2016-11-17Bibliographically approved

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Ahlberg, Per E.
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