Ecteninion
Ecteninion is an extinct genus of meat-eating cynodonts that lived during the Late Triassic in South America. The type species Ecteninion lunensis was named by R.N. Martinez, C.L. May, and C.A. Forster in 1996. The holotype of E. lunensis is PVSJ 422, it's known from a nearly complete skull of about in length. It was found in the Cancha de Bochas Member of the Ischigualasto Formation in the Ischigualasto-Villa Unión Basin in northwestern Argentina. It has been interpreted as a basal eucynodont. The holotype is in the collection of the Universidad Nacional de San Juan.
Body size
Although specimens larger than the holotype are present in the Ischigualasto Formation, they are notably smaller than Trucidocynodon from the Santa Maria Formation.Phylogeny
Ecteninion in a cladogram after Hopson & Kitching :Cladogram after Stefanello et al. :