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Sphenocoelus : ウィキペディア英語版 | Sphenocoelus
''Sphenocoelus'' is an extinct genus of brontothere of the subfamily ''Dolichorhininae'', family ''Brontotheriidae'', endemic to North America during the Middle Eocene epoch (46.2—42 mya), existing for approximately .〔(PaleoBiology Database: ''Sphenocoelus'', basic info )〕 ==Taxonomy== ''Sphenocoelus'' was named by Osborn (1895). It is not extant. Its type is Sphenocoelus uintensis. It was assigned to ''Brontotheriidae'' by Osborn (1895) and Carroll (1988); and to ''Dolichorhininae'' by Mader (1998).〔R. L. Carroll. 1988. Vertebrate Paleontology and Evolution. W. H. Freeman and Company, New York 1-698〕〔B. J. Mader. 1998. Brontotheriidae. In C. M. Janis, K. M. Scott, and L. L. Jacobs (eds.), Evolution of Tertiary Mammals of North America〕
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