Radinsky, Leonard B.2005-10-062005-10-061967http://hdl.handle.net/2246/252323 p. : ill. ; 24 cm.Includes bibliographical references (p. 23)."The rhinocerotoid family Hyrachyidae, which in its last review (Wood, 1934) included four genera and 12 species, is reduced to a subfamily, with one genus and three species, and included in the tapiroid family Helaletidae. Because the European genus Chasmotherium can be traced back to Hyrachyus (via the lineage Hyrachyus modestus (=H. 'stehlini')-Hyrachyus minimus-Chasmotherium cartieri), the monotypic subfamily Chasmotheriinae is transferred to the Helaletidae"--P. 19 & 21.2052447 bytesapplication/pdfen-USQL1 .A436 no.2313, 1967Hyrachyus.Chasmotherium.Helaletidae -- Evolution.Perissodactyla -- Evolution.Mammals, Fossil -- Wyoming.Mammals, Fossil -- West (U.S.)Mammals, Fossil -- Eurasia.Paleontology -- Eocene -- Wyoming.Paleontology -- Eocene -- West (U.S.)Paleontology -- Eocene -- Eurasia.Paleontology -- Wyoming.Paleontology -- West (U.S.)Paleontology -- Eurasia.text