Calyptocephalellidae

Calyptocephalella is a genus of frogs in the family Calyptocephalellidae. It is represented by a single living species, Calyptocephalella gayi, commonly known as the helmeted water toad, Chilean helmeted bull frog, or wide-mouthed toad. Additionally, there are a few extinct species that are only known from Late Cretaceous and Paleogene fossil remains from Patagonia in South America and the Antarctic Peninsula (at times when it was warmer and wetter). The helmeted water toad living today is aquatic to semi-aquatic, and found in deep ponds and reservoirs in central Chile and possibly adjacent we

The Calyptocephalellidae are a family of toads (although not true members of the Bufonidae) found in Chile containing two living genera, Calyptocephalella and Telmatobufo.

Telmatobufo is a genus of frogs (false toads) endemic to southern Chile. Their closest living relative is the monotypic helmeted water toad, Calyptocephalella gayi. These frogs were recently removed from the Leptodactylidae and placed in a new family, the Calyptocephalellidae. All three species of Telmatobufo that have been assessed by the IUCN are considered threatened.