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''Gastrotheca guentheri'' (common name: Guenther's marsupial frog, dentate marsupial frog) is a species of frog in the Hemiphractidae family. It is found in the Andes of southern Colombia and Ecuador. ''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. Natural habitats of ''Gastrotheca guentheri'' are tropical moist forests. These frogs are nocturnal and live on vegetation, including arboreal bromeliads.〔 This species is declining in abundance. One cause of the declines is habitat loss, but the species has also declined within suitable habitat in Ecuador, possibly because of climate change or chytridiomycosis.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gastrotheca guentheri」の詳細全文を読む スポンサード リンク
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