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Heliobatis
''Heliobatis'' is an extinct genus of ray in the Myliobatiformes family Dasyatidae.〔 At present the genus contains the single species ''Heliobatis radians''.
The genus is known primarily from the Early Eocene, Wasatchian stage, Fossil Lake deposits. Fossil Lake is part of the Green River Formation in southwest Wyoming.〔 ''Heliobatis'' is one of only two known rays to have been found in the Green River formation; the other species, Asterotrygon maloneyi, was only recognized and described in 2004.
==History and classification==
The genus was described from a single incomplete holotype specimen, number ''YPM 528'', currently residing in the collections of the Peabody Museum of Natural History, New Haven, Connecticut, USA.〔 The specimen was collected from an outcrop of Fossil Lake and presents a dorsal view of the fish. It was first studied by prolific American paleontologist Othniel Charles Marsh. He published his brief 1877 type description in the ''American Journal of Science''.〔 Two years later Edward Drinker Cope, rival to Marsh, published a description for a ray specimen giving it the name ''Xiphotrygon acutidens.'' though the description by Cope is more complete and includes an illustration of his type specimen, the old name ''Heliobatis'' has seniority. In 1947 Henry Weed Fowler published a very brief description of a ray genus he dubbed ''Palaeodasybatis discus'' based on a partly restored Academy of Natural Sciences specimen, number ''ANSP 89344.'' The specimen, which was subsequently lost, was noted for having a more rounded or disc like body than ''Heliobatis.'' The genus was synonymized with ''Heliobatis'' based on illustrations of Fowler's type specimen, characterizing the more rounded appearance as an artifact of the incomplete nature of Marsh's holotype.〔
The generic epithet ''Heliobatis'' is a derivation of the words ''helios'' meaning "the sun" and ''batis,'' meaning "skate" or "ray." The derivation of the specific epithet ''radians'' is not mentioned in Marsh's description.〔
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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