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| image = Plesiadapis cooki (2).jpg | image_width = 250px | image_caption = ''P. cooki'' fossil | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = †Plesiadapiformes | superfamilia = †Plesiadapoidea | familia = †Plesiadapidae | genus = †''Plesiadapis'' | genus_authority = Gervais, 1877 | type_species = †''Plesiadapis tricuspidens'' | subdivision_ranks = Paleospecies | subdivision = †''Plesiadapis walbeckensis'' Russell, 1964 †''Plesiadapis remensis'' Lemoine, 1887 †''Plesiadapis tricuspidens'' Gervais, 1877 †''Plesiadapis russelli'' Gingerich, 1976 †''Plesiadapis insignis'' (Piton, 1940) †''Plesiadapis praecursor'' Gingerich, 1975 †''Plesiadapis anceps'' Simpson, 1936 †''Plesiadapis rex'' (Gidley, 1923) †''Plesiadapis gingerichi'' Rose, 1981 †''Plesiadapis churchilli'' Gingerich, 1975 †''Plesiadapis fodinatus'' Jepsen, 1930 †''Plesiadapis dubius'' (Matthew, 1915) †''Plesiadapis simonsi'' Gingerich, 1975 †''Plesiadapis cookei'' Jepsen, 1930 }} ''Plesiadapis'' is one of the oldest known primate-like mammal genera which existed about 55-58 million years ago in North America and Europe.〔 ''Plesiadapis'' means "near-Adapis", which is a reference to the Eocene lemuriform, ''Adapis''. ''Plesiadapis tricuspidens'', the type specimen, is named after the three cusps present on its upper incisors. == Origins and discovery == The first discovery of ''Plesiadapis'' was made by François Louis Paul Gervaise in 1877, who first discovered ''Plesiadapis tricuspidens'' in France. The type specimen is MNHN Crl-16, and is a left mandibular fragment dated to the early Eocene epoch. This genus probably arose in North America and colonized Europe on a landbridge via Greenland. Thanks to the abundance of the genus and to its rapid evolution, species of ''Plesiadapis'' play an important role in the zonation of Late Paleocene continental sediments and in the correlation of faunas on both sides of the Atlantic. Two remarkable skeletons of ''Plesiadapis'', one of them nearly complete, have been found in lake deposits at Menat, France.〔 Although the preservation of the hard parts is poor, these skeletons still show remains of skin and hair as a carbonaceous film—something unique among Paleocene mammals. Details of the bones are better preserved in fossils from Cernay, also in France, where ''Plesiadapis'' is one of the most common mammals. 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「Plesiadapis」の詳細全文を読む スポンサード リンク
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