Pachycheilosuchus
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Pachycheilosuchus Temporal range: Early Cretaceous |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Sauropsida |
| Subclass: | Diapsida |
| Infraclass: | Archosauromorpha |
| (unranked): | Crurotarsi |
| Superorder: | Crocodylomorpha |
| (unranked): | Mesoeucrocodylia |
| Genus: |
Pachycheilosuchus Rogers, 2003 |
| Species | |
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Pachycheilosuchus (meaning "thick lipped crocodile") is an extinct genus of mesoeucrocodylian from the Early Cretaceous of Texas, United States. Previously known, in part, as the "Glen Rose form", this crocodylomorph is notable for its procoelous vertebrae, otherwise found only in derived eusuchian crocodilians (the vertebrae articulate with a cup on the anterior surface and a rounded posterior surface), a thick margin on the maxillae (the main tooth-bearing bones of the upper jaw; thus "thick lipped crocodile"), and a shield of armor on the neck formed by the fusion of six individual scutes.
Pachycheilosuchus is based on SMU 75278, a right maxilla, with the remains of at minimum 13 other individuals also known, representing most of the skeleton except hands, feet, and part of the skull. The remains were recovered near the top of the Glen Rose Formation of Erath County in central Texas, in rocks dating from the early Albian faunal stage. The fossils were found in a bonebed in a limestone rock unit, with scattered lenses of mudstone, probably deposited in a shallow, protected, nearshore brackish water setting. The type species is P. trinquei, in honor of Lance Trinque, a field assistant who helped discover and excavate the site where this animal's remains were found. This genus was named and described by Jack Rogers in 2003.
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