Frogs and salamanders from the Upper Jurassic Morrison Formation (Quarry Nine, Como Bluff) of North America

Abstract

ABSTRACT Previously undescribed frog and salamander bones from the Morrison Formation, at Quarry Nine, Como Bluff, Wyoming, are reported. One anuran ilium is diagnostically discoglossid and forms the basis of Enneabatrachus hechti, gen. et sp. nov. A second ilium is diagnostically pelobatid and is the earliest record for the family Pelobatidae, although it is indeterminate below family level. Salamander vertebrae appear to represent two morphological types but neither can be diagnosed critically. The previously described anuran taxa Eobatrachus agilis Marsh and Comobatrachus aenigmatis Hecht and Estes and the salamander Comonecturoides marshi Hecht and Estes are all based on non-determinate elements and must be considered nomina dubia at our present state of knowledge.