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Undorosaurus
''Undorosaurus'' is an extinct genus of ophthalmosaurid ichthyosaur known from Ul'yanovsk Province of western Russia.
==Description==
''Undorosaurus'' is known from the holotype UPM EP-II-20 (527), a partial three-dimensionally preserved skeleton which preserved partial skull. It was collected near the Volga river at Gorodische from the ''Epivirgatites nikitini'' ammonoid zone, dating to the Late Jurassic.〔
Maisch and Matzke (2000) regarded ''Undorosaurus'' to be a species of ''Ophthalmosaurus''. However, Storrs ''et al.'' 2000 rejected this synonymy based on the tooth morphology of the specimen. Chris McGowan and Ryosuke Motani (2003) pointed out two noteworthy differences to ''Ophthalmosaurus'', an incompletely fused ischiopubis and a remarkably strong dentition, and considered ''Undorosaurus'' to be a valid genus of ophthalmosaurid.〔McGowan C, Motani R. 2003. Ichthyopterygia. – In: Sues, H.-D. (ed.): ''Handbook of Paleoherpetology, Part 8, Verlag Dr. Friedrich Pfeil'', 175 pp., 101 figs., 19 plts; München〕 ''Undorosauruss validity is now accepted by most authors, even by Maisch (2010) who originally proposed the synonymy.
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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