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Raoellidae, previously grouped within Helohyidae, is an extinct family of semiaquatic digitigrade artiodactyls in the clade Whippomorpha. Fossils of raoellids are found in Eocene strata of South and Southeast Asia. An exceptionally complete skeleton of ''Indohyus'' from Kashmir suggests that raoellids are the "missing link" sister group to whales (Cetacea). All other Artiodactyla are relatives of these two groups. δO18 values and osteosclerotic bones indicate that the raccoon-like ''Indohyus'' was habitually aquatic, but δC13 values suggest it rarely fed in the water. The authors suggest that this documents an intermediate step in the transition back to water completed by the whales. ==Taxonomy== *''Raoella'' * *''Raoella dograi'' *''Haqueina'' * *''Haqueina haquei'' *''Indohyus'' * *''Indohyus indirae'' * *''Indohyus major'' *''Kunmunella'' * *''Kunmunella kalakotensis'' * *''Kunmunella transversa'' *''Metkatius'' * *''Metkatius kashmiriensis'' *''Khirtharia'' * *''Khirtharia aurea'' * *''Khirtharia dayi'' * *''Khirtharia inflatus'' 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「Raoellidae」の詳細全文を読む スポンサード リンク
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