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Lagrivea
''Lagrivea'' is a fossil genus of squirrel from the Middle Miocene of France. The single species, ''L. vireti'', is known from three mandibles (lower jaws) and two isolated teeth. All come from the fissure filling (a fossil deposit formed when a rock fissure filled with sediment) of La Grive L5, part of the La Grive-Saint-Alban complex in Saint-Alban-de-Roche, southeastern France. ''Lagrivea'' was a large tree squirrel with flat lower incisors and a large, triangular fourth lower premolar (p4). Each of the four cheekteeth (p4 and three molars, m1 through m3) bears a deep basin in the middle of the crown. The m3 is about rectangular in shape, but rounded at the back. Although m1 and m2 have two roots, m3 has three.
==Taxonomy==
Pierre Mein and Léonard Ginsburg described ''Lagrivea vireti'' in 2002 in a review of the ages and faunas of the Miocene fossil sites of La Grive-Saint-Alban in southeastern France.〔Mein and Ginsburg, 2002, p. 29〕 They suggested that it was probably a tree squirrel and related to the Sciurini.〔Mein and Ginsburg, 2002, p. 30〕 ''Lagrivea'' belongs to the squirrel family (Sciuridae), which first appears in the Late Eocene of North America and Early Oligocene of Europe.〔McKenna and Bell, 1997, p. 121〕 The specific name, ''vireti'', honors Jean Viret for his work on the mammals of La Grive-Saint-Alban.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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