 This taxon was considered to be a junior synonym of "M. buceros" by Long and Murry (1995) and later authors, although Stocker and Butler (2013) treated "M. andersoni" as a valid species.The holotype is the only known specimen of this species, although there are other specimens from the Bull Canyon Formation that were referred to "Arribasuchus buceros" by Long and Murry (1995), but not by Stocker and Butler (2013).In 1929, he and Edward Branson described the Metoposauridae "Koskinonodon".