Tecovasaurus
Tecovasaurus is an extinct Late Triassic amniote genus of unknown affinities, known only from teeth. It was initially described as a basal ornithischian dinosaur, subsequently reclassified as a member of the clade Archosauriformes of uncertain phylogenetic placement, and later, taking into account the similarity of its teeth to the teeth of traversodontid cynodonts such as Dadadon, as an amniote of uncertain affinities. It is named after the Tecovas Formation, in Texas and Arizona, which yielded the holotype remains.