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The hingemouth, ''Phractolaemus ansorgii'', is a small freshwater fish that is found only in west central Africa, the sole member of the family Phractolaemidae. The mouth can extend like a small trunk, thus the name, and has just two teeth, both in the lower jaw. The swim bladder has two compartments, and can function as a lung, allowing the hingemouth to survive in oxygen-poor environments. ==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「Hingemouth」の詳細全文を読む スポンサード リンク
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