Therioherpetidae are based on Therioherpeton Cargnin, a small cynodont who lived in the Triassic and was collected in Santa Maria, Santa Maria Formation, the Geopark of Paleorrota, Brazil. This family consists of small carnivores. Presenting features of mammalian basal Morganucodon (Barberena and Bonaparte, 2001). For his characteristic (Barberena and Bonaparte, 1975), was touted as a likely ancestor of mammals.