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The Australosphenida are an infraclass of mammals. Today, there are only five surviving species, which live in Australia and New Guinea, but fossils have been found in Madagascar and Argentina. The surviving species consist of the platypus and four species of echidna. == Taxonomy == This grouping includes the following taxa: *Monotremata, divided into the families Kollikodontidae, Ornithorhynchidae (platypus), Steropodontidae and Tachyglossidae (echidnas) and the genus ''Kryoryctes'' *†Henosferidae, including the genera ''Ambondro'', ''Asfaltomylos'', and ''Henosferus'' from the Jurassic of Argentina and Madagascar. *†Ausktribosphenidae, including the genera ''Ausktribosphenos'', ''Bishops'' from the Middle Jurassic to Lower Cretaceous of Australia. The clade Australosphenida was proposed by Luo ''et al.'' (2001, 2002) and was initially left unranked, as the authors do not apply the Linnaean hierarchy. In Benton (2005), it is ranked as a 'superdivision', i.e. one or two levels below the infraclass. 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「Australosphenida」の詳細全文を読む スポンサード リンク
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