Chaltenobatrachus is a monotypic genus of frogs in the family Batrachylidae. The sole species, Chaltenobatrachus grandisonae, used to be included Atelognathus, which is considered the sister taxon of Chaltenobatrachus.[1]
C. grandisonae (common name: Puerto Eden frog) is endemic to Patagonia, including both Chile and Argentina. It inhabits rainforest and wetlands of the southern fjordlands and Andes in Patagonia.[2] It is known from just few localities: its type locality, Puerto Eden, Wellington Island, Chile, and two mainland sites in Argentina.
Small to medium-sized frogs, C. grandisonae adults reach a snout–vent length of about 46mm, with typical frog-like appearance and body proportions. Back of the body and limbs are rather uniformly bright green with brown to reddish warts. Tadpoles are up to 56mm in total length.[3]
Females of this species lay their eggs in clusters attached to branches or stones under the water in still water, mostly temporary ponds. Each cluster has a few tens of eggs. Eggs are deposited in October (middle austral spring), and development to metamorphosis takes about 10–12 weeks, to December (early summer).[4] In colder sites, development seems to take longer and tadpoles might overwinter.[3]