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Temporal range: 155–99 Ma
Late Jurassic-Early Cretaceous
Glyptops and Adocus.jpg
Skull and shell of Glyptops ornatus, and shell of Adocus punctatus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Testudines
Suborder: Cryptodira
Family: Pleurosternidae
Genus: Glyptops
Marsh, 1890
  • G. plicatulus (type)
    Cope, 1877
  • G. caelatus
    Hay, 1908 (nomen dubium)
  • G. pervicax
    Hay, 1908

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 was previously named Compsemys plicatulus by Edward Drinker Cope.


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.[1] In the meantime, a partial skull, YPM 1784 (described from Como Bluff, Wyoming), was named Glyptops ornatus.[2] Later, Oliver Perry Hay recognized Compsemys plicatulus and Glyptops ornatus as being from the same species, hence the new combination G. plicatulus.[3] Another Morrison species of Glyptops, G. utahensis, was described from a complete shell (CM 3412) found at Dinosaur National Monument in Utah.[4]

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.[5]


  1. ^ E. D. Cope. 1877. On reptilian remains from the Dakota Beds of Colorado. Proceedings of the American Philosophical Society 17(100):193-196
  2. ^ O. C. Marsh. 1890. Notice of some extinct Testudinata. The American Journal of Science and Arts, series 3 40:177-179
  3. ^ O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568.
  4. ^ 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.
  5. ^ E. S. Gaffney. 1979. The Jurassic turtles of North America. Bulletin of the American Museum of Natural History 162(3):95-135