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Neurocranial anatomy of an enigmatic Early Devonian fish sheds light on early osteichthyan evolution
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. Flinders Univ S Australia, Coll Sci & Engn, Adelaide, SA, Australia;Museum Victoria, Dept Sci, Melbourne, Vic, Australia.ORCID iD: 0000-0003-0380-7347
Flinders Univ S Australia, Coll Sci & Engn, Adelaide, SA, Australia;Nat Biodivers Ctr, Leiden, Netherlands.
Univ Oxford, Dept Earth Sci, Oxford, England.
Flinders Univ S Australia, Coll Sci & Engn, Adelaide, SA, Australia.
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2018 (English)In: eLIFE, E-ISSN 2050-084X, Vol. 7, article id e34349Article in journal (Refereed) Published
Abstract [en]

The skull of 'Ligulalepis' from the Early Devonian of Australia (AM-F101607) has significantly expanded our knowledge of early osteichthyan anatomy, but its phylogenetic position has remained uncertain. We herein describe a second skull of 'Ligulalepis' and present micro-CT data on both specimens to reveal novel anatomical features, including cranial endocasts. Several features previously considered to link 'Ligulalepis' with actinopterygians are now considered generalized osteichthyan characters or of uncertain polarity. The presence of a lateral cranial canal is shown to be variable in its development between specimens. Other notable new features include the presence of a pineal foramen, the some detail of skull roof sutures, the shape of the nasal capsules, a placoderm-like hypophysial vein, and a chondrichthyan-like labyrinth system. New phylogenetic analyses place 'Ligulalepis' as a stem osteichthyan, specifically as the sister taxon to 'psarolepids' plus crown osteichthyans. The precise position of 'psarolepids' differs between parsimony and Bayesian analyses.

Place, publisher, year, edition, pages
2018. Vol. 7, article id e34349
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Evolutionary Biology
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URN: urn:nbn:se:uu:diva-357559DOI: 10.7554/eLife.34349ISI: 000433288300001PubMedID: 29807569OAI: oai:DiVA.org:uu-357559DiVA, id: diva2:1239978
Funder
Australian Research Council, DP 140101461Australian Research Council, DE 160100247Available from: 2018-08-20 Created: 2018-08-20 Last updated: 2018-08-20Bibliographically approved

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Clement, AliceAhlberg, Per

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