| Calsoyasuchus Temporal range: Early Jurassic,
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Archosauria |
| Clade: | Pseudosuchia |
| Clade: | Crocodylomorpha |
| Clade: | Crocodyliformes |
| Family: | †Goniopholididae |
| Genus: | †Calsoyasuchus Tykoski et al., 2002 |
| Type species | |
| †Calsoyasuchus valliceps Tykoski et al., 2002
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Calsoyasuchus (meaning "[Dr. Kyril] Calsoyas' crocodile") is a genus of crocodylomorph[1] that lived in the Early Jurassic. Its fossilized remains were found in the Sinemurian-Pliensbachian-age Kayenta Formation on Navajo Nation land in Coconino County, Arizona, United States. Formally described as C. valliceps, it is known from a single incomplete skull which is unusually derived for such an early crocodile relative. This genus was described in 2002 by Ronald Tykoski and colleagues; the specific name means "valley head" and refers to a deep groove along the midline of the nasal bones and frontal bones.[2] It has often been interpreted as the earliest diverging member of Goniopholididae, but other studies have recovered it in various other positions.
- ^ Mesoeucrocodylia is the clade that includes all the living crocodilians and their closest extinct relatives.
- ^ Tykoski, Ronald S.; Rowe, Timothy B.; Ketcham, Richard A.; Colbert, Matthew W. (2002). "Calsoyasuchus valliceps, a new crocodyliform from the Early Jurassic Kayenta Formation of Arizona" (PDF). Journal of Vertebrate Paleontology. 22 (3): 593–611. doi:10.1671/0272-4634(2002)022[0593:CVANCF]2.0.CO;2. S2CID 85969174.