Affiliation:
1. Department of Earth Sciences, University of Oxford, South Park Road, Oxford OX1 3AN, UK
Abstract
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
Publisher
Geological Society of London
Subject
Geology,Ocean Engineering,Water Science and Technology
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