Name: Calsoyasuchus ‭(‬Calsoyas‭’ ‬crocodile‭)‬.
Phonetic: Cal-soy-a-soo-kus.
Named By: Ronald S.‭ ‬Tyloski,‭ ‬Timothy B.‭ ‬Rowe,‭ ‬Richard A.‭ ‬Ketcham and Matthew W.‭ ‬Colbert‭ ‬-‭ ‬2002.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Crocodylomorpha,‭ ‬Goniopholididae.
Species: C.‭ ‬valliceps‭ (‬type‭)‬.
Diet: Carnivore.
Size: Skull around‭ ‬38‭ ‬centimetres long.‭ ‬Total length unknown due to lack of post cranial remains.
Known locations: USA‭ ‬-‭ ‬Arizona/Navajo Nation‭ ‬-‭ ‬Kayenta Formation.
Time period: Sinemurian/Pliensbachian of the Jurassic.
Fossil representation: Partial skull.

       The skull that is the holotype of Calsoyasuchus is incomplete with quite a few pieces missing.‭ ‬However CT scanning of the skull has revealed the presence of an intricate network of air passages and a double walled secondary palate‭; ‬a feature of modern crocodiles.‭ ‬How Calsoyasuchus fits into the development of modern crocodiles is still uncertain however considering that this skull construction may have developed in many kinds of prehistoric crocodiles,‭ ‬with modern forms being the only surviving crocs to still feature this.‭ ‬The discovery of Calsoyasuchus also revealed that goniopholidid crocodiles first appeared in the early Jurassic‭; ‬previous discoveries were all dated to the mid Jurassic.
       Aside from Calsoyasuchus a growing number of other extinct creatures are also known from the Kayenta Formation,‭ ‬though perhaps the most famous of these so far is the theropod dinosaur Dilophosaurus.

Further reading
- Calsoyasuchus valliceps, a new crocodyliform from the Early Jurassic Kayenta Formation of Arizona. - Journal of Vertebrate Paleontology. 22 (3): 593–61 - Ronald S. Tykoski, Timothy B. Rowe, Richard A. Ketcham & Matthew W. Colbert - 2002.


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