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Glyptops
''Glyptops'' (Greek for "grooved face") is an extinct genus of cryptodire turtle dating from the Late Jurassic and Early Cretaceous periods 155 to 99 m.y.a. Fossils have been found in South Dakota, Wyoming, Colorado, Utah, New Mexico, Oklahoma, and Texas from both the Morrison and Cedar Mountain formations. The type species is ''G. plicatulus'', which had been named ''Compsemys plicatulus'' by Edward Drinker Cope. ==Taxonomy== The type species, ''Glyptops plicatulus'', was first described as ''Compsemys plicatulus'' on the basis of AMNH 6099, a partial shell from the Late Jurassic Morrison Formation of Colorado.〔E. D. Cope. 1877. On reptilian remains from the Dakota Beds of Colorado. Proceedings of the American Philosophical Society 17(100):193-196〕 In the meantime, a partial skull, YPM 1784 (described from Como Bluff, Wyoming), was named ''Glyptops ornatus''.〔O. C. Marsh. 1890. Notice of some extinct Testudinata. The American Journal of Science and Arts, series 3 40:177-179〕 Later, Oliver Perry Hay recognized ''Compsemys plicatulus'' and ''Glyptops ornatus'' as being from the same species, hence the new combination ''G. plicatulus''.〔O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568.〕 Another Morrison species of ''Glyptops'', ''G. utahensis'', was described from a complete shell (CM 3412) found at Dinosaur National Monument in Utah.〔C. W. Gilmore. 1916. Description of a new species of tortoise from the Jurassic of Utah. Annals of Carnegie Museum 10(1-2):7-12.〕 The species ''Glytops caelatus'' Hay, 1908 was described from the middle Cretaceous (late Aptian-early Albian) Arundel Formation of Maryland. However, it was later dismissed as a ''nomen dubium'' based on non-diagnostic remains.〔E. S. Gaffney. 1979. The Jurassic turtles of North America. Bulletin of the American Museum of Natural History 162(3):95-135 〕
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