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Hapalodectidae (literally "soft biters" ''hapalos'' = "soft, tender," ''dêktês'' = "biter") is an extinct family of relatively small-bodied (1– to 8-kg) mesonychian placental mammals from the Paleocene and Eocene of North America and Asia. Hapalodectids differ from the larger and better-known mesonychids in having teeth specialized for cutting (presumably meat), while the teeth of other mesonychids, such as ''Mesonyx'' or ''Sinonyx'', are more specialized for crushing bones.〔 Hapalodectids were once considered a subfamily of the Mesonychidae, but the discovery of a skull of ''Hapalodectes hetangensis'' showed additional differences justifying placement in a distinct family. In particular, ''H. hetangensis'' has a postorbital bar closing the back of the orbit,〔 a feature lacking in mesonychids. The skeleton of hapalodectids is poorly known and of the postcranial elements, only the humerus has been described. The morphology of this bone indicates less specialization for terrestrial locomotion than in mesonychids. ==Species== Family Hapalodectidae *Genus ''Hapalodectes'' * * ''H. anthracinus'' Zhou et Gingerich, 1991 * * ''H. dux'' Lopatin, 1999 * * ''H. hetangensis'' Ting et Li, 1987 * * ''H. huanghaiensis'' Tong et Wang, 2006 * * ''H. leptognathus'' Osborn et Wortman, 1892 * * ''H. paleocenus'' Beard et all., 2010 * * ''H. serus'' Matthew et Granger, 1925 *Genus ''Hapalorestes'' * *''H. lovei'' *Genus ''Honanodon'' * *''H. chow'' * *''H. hebetis'' * *''H. lushiensis'' * *''H. macrodontus'' *Genus ''Lohoodon'' * *''L. lushiensis'' *Genus ''Metahapalodectes'' * *''M. makhchinus'' 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「hapalodectidae」の詳細全文を読む スポンサード リンク
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