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The one that got away from Smith Woodward: cranial anatomy of Micrornatus (Acanthomorpha: Scombridae) revealed using computed microtomography

By
Hermione T. Beckett
Hermione T. Beckett
Department of Earth Sciences, University of Oxford, South Park Road, Oxford OX1 3AN, UK
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Matt Friedman
Matt Friedman
Department of Earth Sciences, University of Oxford, South Park Road, Oxford OX1 3AN, UK
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Published:
January 01, 2016

Abstract

The monotypic scombrid fish Micrornatus is represented by a single skull from the early Eocene (Ypresian) London Clay Formation of southeastern England. Although Arthur Smith Woodward substantially increased the diversity of scombrids and scombrid-like taxa known from this deposit, he seems not to have studied the fossil that would later be recognized as Micrornatus. Here we re-examine this specimen using computed microtomography, with two principal aims: first, a revised anatomical account with an emphasis on concealed features; and, second, ‘proof-of-concept’ for the tomographic study of fish crania from the London Clay. Scans reveal new details of the braincase, suspensorium and ventral hyoid arch. We compare the cranial anatomy of Micrornatus with other members of Eocoelopomini, a group also containing the genera Eocoelopoma, Palaeothunnus and possibly Landanichthys. Clarification of the taxonomy and phylogeny of early fossil scombrids is needed, and we suggest that computed tomography will be a useful tool for revealing the anatomical evidence needed to accomplish this goal.

Supplementary material:

Micrornatus hopwoodi NHMUK PV OR 36136 PLY files are available at: http://doi.org/10.6084/m9.figshare.1561381

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Contents

Geological Society, London, Special Publications

Arthur Smith Woodward: His Life and Influence on Modern Vertebrate Palaeontology

Z. Johanson
Z. Johanson
Natural History Museum, UK
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P. M. Barrett
P. M. Barrett
Natural History Museum, UK
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M. Richter
M. Richter
Natural History Museum, UK
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M. Smith
M. Smith
Natural History Museum, UK
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Geological Society of London
Volume
430
ISBN electronic:
9781862399624
Publication date:
January 01, 2016

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