Name: Procaimanoidea ‭(‬Before caiman forms‭)‬.
Phonetic: Pro-cay-men-oy-dee-a.
Named By: Charles W.‭ ‬Gilmore‭ ‬-‭ ‬1946.
Synonyms: Hassiacosuchus kayi.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Crocodilia,‭ ‬Alligatoridae,‭ ‬Alligatorinae.
Species: P.‭ ‬utahensis‭ (‬type‭)‬,‭ ‬P.‭ ‬kayi.
Diet: Carnivore.
Size: Uncertain,‭ ‬but thought to be small.
Known locations: USA,‭ ‬Utah and Wyoming‭ ‬-‭ ‬Green River Formation.
Time period: Early Eocene.
Fossil representation: Holotype established from a skull and partial left hind leg.‭ ‬Additionally remains have since been attributed to the genus.

       In life Procaimanoidea would have lived like a small alligator feeding upon a variety of animals from fish such as Diplomystus,‭ ‬to invertebrates like freshwater shrimp.‭ ‬The main evidence for this comes from the two different kinds of teeth in the jaws,‭ ‬sharper conical teeth in the front,‭ ‬and more rounded teeth in the back.‭ ‬Procaimanoidea could have used these teeth to both seize slippery,‭ ‬soft bodied prey like fish,‭ ‬while also cracking open the armoured exoskeletons of invertebrates to get at‭ ‬the soft flesh within.‭ ‬However,‭ ‬Procaimanoidea was not unique as other crocodiles such as Bernissartia from the early Cretaceous also had a similar variance in its teeth.
       Another Eocene crocodile named Hassiacosuchus once had a second species named Hassiacosuchus kayi,‭ ‬but in‭ ‬1967‭ ‬this species was found to actually belong to the Procaimanoidea genus‭ ‬(study‭ ‬by Wassersug and Hecht‭)‬.‭ ‬These attributed remains were used to establish the second species for Procaimanoidea,‭ ‬P.‭ ‬kayi.‭

Further reading
- A new crocodilian, Hassiacosuchus kayi, from the Bridger Eocene beds of Wyoming. - Annals of Carnegie Museum 28:207-220. - C. C. Mook - 1941.
- A new crocodilian from the Eocene of Utah. - Journal of Paleontology 20(1):62-67. - C. W. Gilmore - 1946.
- The status of the crocodylid genera Procaimanoidea and Hassiacosuchus in the New World. - Herpetologica. 23 (1): 30–34. - R. J. Wassersug, M. K. Hecht - 1967.


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