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A choristoderan reptile from the Lower Cretaceous of Japan

Evans, SE; Manabe, M; (1999) A choristoderan reptile from the Lower Cretaceous of Japan. SP PALAEONT (60) 101 - 119.

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Abstract

A new, small (c. 250 mm snout-vent length) choristoderan reptile, Shokawa ikoi gen. et sp. nov., is described from the early Cretaceous Okurodani Formation, Tetori Group, of Japan. It is distinguished from other known choristoderans in having a long neck with at least 16 cervical vertebrae. The skeleton is pachyostotic and the caudal neural spines are much taller than those of the Jurassic Cteniogenys, both features suggesting a more aquatic lifestyle. Phylogenetic analysis places the new Japanese form in a small clade with Cteniogenys and the Triassic Pachystropheus. This clade is the sister taxon of crown-group Neochoristodera.

Type: Article
Title: A choristoderan reptile from the Lower Cretaceous of Japan
Keywords: FOSSIL RECORD, DIAPSIDA, CTENIOGENYS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology
URI: http://discovery.ucl.ac.uk/id/eprint/57165
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