Tuesday, 3 December 2013

Calsoyasuchus valliceps

Calsoyasuchus from the Early Jurassic of Arizona is the earliest known member of the Goniopholidae. The goniopholids are an extinct group of crocodylomorphs closely related to the modern crocodilians.

Calsoyasuchus valliceps
Tyloski, Rowe, Ketcham and Colbert, 2002
Meaning of generic name
to honor Dr. Kyril Calsoyas+ Greek soukhos "crocodile".
Meaning of specific name
from combination of valles (L. valley), and cephale, (Gr. head), in reference to the deep median valley present on the dorsal surface of nasals and frontal bones.

[cephale is NOT shortened -ceps, which comes from latin "capere" = take, like what you take in a stride or in a bite]
Skull length: 38 cm, Length: [not given]
Holotype (TMM 43631-1): partial skull
Age and Distribution
Horizon: Kayenta Formation. Early Jurassic (Sinemurian-Plienbaschian).

Locality: Gold Spring drainage basin, Adeii Eechii Cliffs, Navajo Nation, Coconino County, Arizona.
Archosauromorpha Crurotarsi Paracrocodylomorpha Mesoeucrocodylia Goniopholididae
Further Reading
R. S. Tykoski, T. B. Rowe, R. A. Ketcham and M. W. Colbert. 2002. Calsoyasuchus valliceps, a new crocodyliform from the Early Jurassic Kayenta Formation of Arizona. Journal of Vertebrate Paleontology 22(3):593-611
What about "croc"? [This is of course a creationist comment, see image on the original palaeocritti site]

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