Rhinoderma

Rhinoderma, commonly known as Darwin's frogs, is a genus of small frogs found in Chile and adjacent parts of Argentina.[1] It has just two species, of which the Chile Darwin's frog (R. rufum) is highly endangered or may already be extinct. The better-known Darwin's frog (R. darwinii) is endangered.

Rhinoderma
Darwin's frog (Rhinoderma darwinii)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Amphibia
Order:	Anura
Suborder:	Neobatrachia
Clade:	Hyloidea
Family:	Rhinodermatidae Bonaparte, 1850
Genus:	Rhinoderma Duméril & Bibron, 1841
Species
R. darwinii R. rufum
Distribution of Rhinodermatidae (in black)

Both species are notable for their unusual breeding, with the tadpoles being raised inside the mouths of the males.[1] The eggs are laid on the ground. The male frog transports the tadpoles into his enlarged vocal sac. In the Chile Darwin's frog, the tadpoles are transported to a water source and released for the duration of their development. In Darwin's frog, they reside in the vocal sac until metamorphosis. They may carry between five and 15 offspring. Darwin's frogs are separated into a separate family based purely upon this behavioural adaptation, which is unique among frogs.

Darwin's frogs are small, reaching a size of only 3 cm (1.2 in) in length.[1] They are predominantly brown or green frogs, and have long, narrow noses. They are primarily terrestrial.

References

1. Zweifel, Robert G. (1998). Cogger, H.G.; Zweifel, R.G. (eds.). Encyclopedia of Reptiles and Amphibians. San Diego: Academic Press. p. 103. ISBN 0-12-178560-2.

• Cogger, H.G.; R.G. Zweifel; D. Kirschner (2004). Encyclopedia of Reptiles & Amphibians Second Edition. Fog City Press. ISBN 1-877019-69-0.