Teraterpetidae Sues, 2003 Trilophosaurs are lizard-like Triassic allokotosaur reptiles related to the archosaurs.

It had a short, unusually heavily built skull, equipped with massive, broad flattened cheek teeth with sharp shearing surfaces for cutting up tough plant material.

Teeth are absent from the premaxilla and front of the lower jaw, which in life were probably equipped with a horny beak.

Below is a cladogram showing the phylogenetic relationships of Trilophosauridae within Archosauromorpha as recovered by Nesbitt et al.

[3] Lepidosauromorpha Protorosaurus speneri Macrocnemus bassanii Langobardisaurus pandolfii Tanytrachelos ahynis Amotosaurus rotfeldensis Tanystropheus longobardicus Mesosuchus browni Rhynchosaurus articeps Teyumbaita sulcognathus Archosauriformes Prolacerta broomi Pamelaria dolichotrachela Azendohsaurus laaroussii Azendohsaurus madagaskarensis Teraterpeton hrynewichorum Trilophosaurus buettneri "Trilophosaurus" jacobsi Spinosuchus caseanus holotype