(Cycloramphus acangatan)
Cycloramphus acangatan is a species of frogs in the family Cycloramphidae. It is endemic to the Serra de Paranapiacaba, the state of São Paulo state, Brazil. The specific name acangatan is derived from the Tupi language words acanga (=head) and atan (=strong) and refers to the strong and massive jaw adductor muscles in this species.