Duméril, 1806
Matamata turtles
Recognition
The sole species in this genus, Chelus fimbriatus, the matamata, is one of the strangest turtles; its large flattened head with long narrow snout and cutaneous fringes and the three knobby keels on its algae-covered carapace effectively conceal it as it lurks in or prowls along the bottom of some blackwater South American stream.