A new temnospondyl amphibian from the Late Triassic of Texas

A skull representing a new genus and species of Late Triassic temnospondyl, Rileymillerus cosgriffi, is described from the Cooper Canyon Formation, upper Dockum Group of Garza County, Texas. Rileymillerus resembles Latiscopus disjunctus in size and proportions, but the very poorly preserved unique type specimen of L. disjunctus indicates that the taxon should be considered a nomen dubium. Characters of R. cosgriffi include its small size combined with skull, lack of lateral line canals, lateral exposure of the palatine on the skull surface, and lack of otic notch/quadrate angle. No postcranial material can be definitely associated, although we describe a partial vertrebral column that might pertain to R. cosgriffi. Relationships of R cosgriffi are uncertain. The possibilities of a close relationship Almsauridae, Tuplika are explicitly examined, but for the present we consider have been converted to the tripartite (part, feature, state) as a 125-character data matrix in the Appendix.