Amniota - Pelycosauria

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

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Type: Trispondylus texensis

Ecology: