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Temporal range: Eocene
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Crocodilia
Family: Alligatoridae
Subfamily: Alligatorinae
Genus: Procaimanoidea
Gilmore, 1946
  • P. utahensis Gilmore, 1946 (type)
  • P. kayi (Mook, 1941 [originally Hassiacosuchus kayi])

Procaimanoidea ("Before Caiman-forms") is an extinct genus of alligatorid from the Eocene of North America. It was named posthumously in 1946 by Charles W. Gilmore; the type species is P. utahensis, from the Uintan (middle Eocene) of Utah. It is based on USNM 15996, a nearly complete skull and partial left hind leg.[1] A second species, P. kayi, was named in 1941 by C.C. Mook as a species of Hassiacosuchus, for remains from the Bridgerian (early Eocene) of Wyoming.[2] It was reassigned to Procaimanoidea in 1967 by Wassersug and Hecht.[3] Procaimanoidea was a small alligatorid, and slightly heterodont, the last four teeth on each side of the jaws having blunt tips.[1]


  1. ^ a b Gilmore, Charles W. "A new crocodilian from the Eocene of Utah". Journal of Paleontology. 20 (1): 62–67. 
  2. ^ Mook, C.C. (1941). "A new crocodilian, Hassiacosuchus kayi, from the Bridger Eocene beds of Wyoming". Annals of the Carnegie Museum. 28: 207–220. 
  3. ^ Wassersug, R.J.; Hecht, M.K. (1967). "The status of the crocodylid genera Procaimanoidea and Hassiacosuchus in the New World". Herpetologica. 23 (1): 30–34. 

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