"Crocodylus" affinis

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"Crocodylus" affinis is an extinct species of crocodyloid from the Eocene of Wyoming. Fossils were first described from the Bridger Formation by American paleontologist Othniel Charles Marsh in 1871. Marsh described the species, along with every other species of crocodyloid in the Bridger Formation, under the genus Crocodylus.[1] The known specimen of "Crocodylus" affinis is a skull found at Grizzly Buttes, Wyoming, measuring 13 inches in length on the upper surface.[2] Recent phylogenetic studies of crocodyloids show that "C." affinis is not a species of Crocodylus, but a genus has not yet been erected to include the species. Other Bridger species such as Crocodylus clavis and Brachyuranochampsa zangerli have been synonymized with "C." affinis.[3][4]

"Crocodylus" affinis
Crocodylus affinis Mook.jpg
Scientific classification
"C." affinis
Binomial name
†"Crocodylus" affinis
The holotype skull of "Crocodylus" affinis (AMNH 6177) on display in the American Museum of Natural History


  1. ^ Mook, C.C. (1921). "Description of a skull of a Bridger crocodilian" (PDF). Bulletin of the American Museum of Natural History. 44 (11): 111–116.
  2. ^ Marsh, O. C. (1871). Notice of some new fossil reptiles from the Cretaceous and Tertiary formations. American Journal of Science, s3-1(6), 447–459. doi:10.2475/ajs.s3-1.6.447
  3. ^ de Buffrenil, V.; Buffetaut, E. (1981). "Skeletal growth lines in an Eocene crocodilian skull from Wyoming as an indicator of ontogenic age and paleoclimatic conditions". Journal of Vertebrate Paleontology. 1 (1): 57–65. doi:10.1080/02724634.1981.10011879.
  4. ^ Brochu, C. A. (2000). "Phylogenetic relationships and divergence timing of Crocodylus based on morphology and the fossil record". Copeia. 2000 (3): 657–673. doi:10.1643/0045-8511(2000)000[0657:pradto]2.0.co;2.