Cynodont teeth from the Upper Triassic of New Mexico, USA

Three teeth from the Upper Triassic (Rhaetian?) Redonda Formation of the Ch inle Group in east-central New Mexico are assigned to the Cynodontia as an indeterminate genus of Trirachodontidae. These teeth are transversely widen ed with a single, large central cusp and anterior/posterior cingula with ac cessory cuspules. The microstructure of the enamel contains abundant enamel tubules that appear to represent typical synapsid columnar enamel. This is the youngest record of Trirachodontidae, and the first Laurasian record.