Abstract

Restudy of the type specimen and preliminary study of additional material of alcovensis [from Natrona County, Wyoming] led to the conclusion that Corosaurus is the most advanced nothosaur known to date. Its shoulder and pelvic girdles show specializations resembling those of Liassic plesiosaurs. The structure of the limbs also shows advanced aquatic specialization, but not in the direction of plesiosaurian paddles. This conclusion agrees with stratigraphic evidence to suggest that the Alcova limestone is of late Triassic age.

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