†Trichasaurus Williston 1913 (pelycosaur)
Synonym: Trispondylus Williston 1910 [replaced name]
Parent taxon: Pelycosauria according to R. R. Reisz 1986
Sister taxa: Bathygnathus, Caseamorpha, Caseasauria, Clepsydropidae, Edaphosauria, Luperosaurus, Milosaurus, Nitosaurus, Ophiacodontia, Protoclepsydrops, Scoliomus, Thalattosauria, Xyrospondylus
Subtaxa: Trichasaurus texensis
Type: Trispondylus texensis
Ecology: