Marsupial frog

Description

Gastrotheca guentheri (common name: Guenther's marsupial frog,dentate marsupial frog) is a species of frog in the family Hemiphractidae.It is found in the Andes of Colombia (Cordillera Occidental and Colombian Massif) and Ecuador (Cordillera Occidental).Gastrotheca guentheri is the only known frog with true teeth in both of its jaws,as indicated by the name of the genus it originally typified,Amphignathodon,described by George Albert Boulenger in 1882.Gastrotheca guentheri is the only known frog with true teeth in its lower jaw.Its teeth have re-evolved after being absent for over 200 million years,challenging Dollo's law.Re-evolution of teeth in the lower jaw may have been made easier because the frogs have teeth in their upper jaw so there was already a biochemical pathway for developing teeth after 200 million years,unlike,say,birds.Males measure 68–78 mm (2.7–3.1 in) and females 70–82 mm (2.8–3.2 in) in snout–vent length.