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The occipital region in the basal bony fish Erpetoichthys calabaricus (Actinopterygii: Cladistia)

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Erpetoichthys calabaricus has unusual cranio-vertebral anatomy, with an occipital centrum forming a component part of the compound basiexoccipital bone, and a ‘free-floating’ occipital neural arch that differs from accessory arches found in some teleosts. The occipital neural arch bears autapomorphic lateral projections that articulate with small rod-like bones resembling the spatial relationship of parapophyses and ribs, a feature normally restricted to vertebral centra. Based on analyses of cleared and stained specimens, computed tomography and histology, it is hypothesized that the lateral projections and associated rod-shaped bones are structures that share developmental homologies to the unique ‘dorsal ribs’ of Polypteridae.
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Keywords: Polypterus; horizontal septum; intermusculars; myosepta

Document Type: Research Article

Affiliations: Department of Geology, Amherst College, Amherst, MA 01002, U.S.A.

Publication date: 2008-09-01

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