|
The Pipidae are a family of primitive, tongueless frogs. The 30 species in the family Pipidae are found in tropical South America (genus ''Pipa'') and sub-Saharan Africa (four other genera). These frogs are exclusively aquatic and have numerous morphological modifications befitting their habitat. For example, the feet are completely webbed, the body is flattened, and a lateral line system is present. In addition, pipids possess highly modified ears for producing and receiving sound underwater. They lack a tongue or vocal cords, instead having bony rods in the larynx that help produce sound. They range from in body length. The fossil record for pipids is relatively good, with 12 extinct species known. Six of these are placed in the extant genus ''Xenopus'', the remainder in extinct genera. These fossils are known from Africa, South America, and the Middle East back to the Lower Cretaceous.〔 == Genera == Family Pipidae * ''Hymenochirus'' - dwarf clawed frogs * ''Pseudhymenochirus'' - Merlin's dwarf gray frog or Merlin's clawed frog * ''Xenopus'' - common clawed frogs * ''Silurana'' - tropical clawed frogs * ''Pipa'' - Surinam toads 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「Pipidae」の詳細全文を読む スポンサード リンク
|