The Calyptocephalellidae are a family of toads found in Chile containing two living genera, Calyptocephalella and Telmatobufo, as well as a prehistoric, extinct member classified as Calyptocephalellidae indet.[1] The genus Calyptocephalella contains one living species, the helmeted water toad (C. gayi), which is a very large and mostly aquatic. The genus Telmatobufo contains four species, T. australis, T. bullocki, T. ignotus, and T. venustus.[2] All five living species within the family are considered threatened, with T. bullocki and T. venustus being classified as critically endangered.[3]