Comobatrachus (meaning "Como Bluff frog") is a dubious genus of extinct frog known only from the holotype, YPM 1863, part of the right humerus, found in Reed's Quarry 9 near Como Bluff, Wyoming in the Late Jurassic-aged Morrison Formation.Foster, J. (2007). Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. 389pp. .Foster, J. (2007). "Anura (Frogs)." pp. 135-136. The holotype was commented on but not described by Moodie in 1912,Moodie, R. L. (1912). An American Jurassic frog. The American Journal of Science, series 4 34(27):286-288 although it was probably discovered alongside the holotype of Eobatrachus, but was not described by Othniel Charles Marsh when he named Eobatrachus in 1887.March, O. C. (1887). American Jurassic mammals. The American Journal of Science, series 3 33(196):327-348 The type, and only species, C. aenigmatis, was named and described in 1960.Hecht, M. K. and Estes, R. (1960). Fossil amphibians from Quarry Nine. Postilla 46:1-19 It was probably related to the contemporaneous Eobatrachus.Evans, S. E. and Milner, A. R. (1993). Frogs and salamanders from the Upper Jurassic Morrison Formation (Quarry Nine, Como Bluff) of North America. Journal of Vertebrate Paleontology 13(1):24-30
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