Abstract
ABSTRACT Crossotelos annulatus, an Early Permian nectridean amphibian, has been known previously only from isolated vertebrae. This last and largest end member of a Pennsylvanian urocordylid radiation is described from articulated axial skeleton and partial skull material collected in northern Oklahoma. Diagnostic characters include complex accessory articulations of trunk vertebrae, intravertebral nerve openings, and distinctive tooth form. Previously attributed skull material, “Cricotillus brachydens” and “Trimerorhachis leptorhynchus” are confirmed as junior synonyms of Crossotelos annulatus. Crossotelos is reconstructed as laterally compressed with a stiff trunk and elongate maneuverable tail, and is interpreted as a pelagic piscivore.
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