Labidosaurus hamatus (Cope 1895)
- Dataset
- The skull and the palaeoecological significance of Labidosaurus hamatus, a captorhinid reptile from the Lower Permian of Texas
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Chordata
- class
- Reptilia
- order
- Testudines
- family
- Captorhinidae
- genus
- Labidosaurus
- species
- Labidosaurus hamatus
diagnosis
Diagnosis: A single-tooth-rowed captorhinid distinguished by the following features: extreme angulation of the alveolar margin of the premaxilla, at roughly 45 ° to the long axis of the maxillary alveolar margin; a low dorsum sellae; an extensive, thin sagittal flange of the dorsum sellae that deeply invades the retractor pit and sella turcica; lateral exposure of prootic greatly reduced by the stapedial and opisthotic contacts and equal to about one-third of the entire lateral portion of the bone; slender stapes; and a small intermeckelian medius foramen that is bounded anteriorly by a small postsymphysial dorsal extension of the splenial. Holotype: AMNH 4341 (American Museum of Natural History, New York, NY, USA), a complete skull. Material examined: CM 73370 (Carnegie Museum of Natural History, Pittsburgh, PA, USA) (formerly ‘ UCLA VP 3167 ’; Vertebrate Palaeontology Collections, University of California, Los Angeles, CA, USA), greater part of an articulated skeleton that includes a complete, undistorted skull with tightly closed mandible; CM 73371 (formerly ‘ UCLA VP 3200 ’), greater part of an articulated skeleton that includes a complete, obliquely compressed skull, with partly detached left and fully detached right mandibular rami; CM 76876, a partial right mandibular ramus; FMNH UR 161 (Field Museum of Natural History, Chicago, IL, USA), a complete skull with detached braincase; MCZ 8727 (Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA), a nearly complete skull that has undergone extreme dorsoventral compression. Horizon and geographical provenance: Lowermost strata (the ‘ Arroyo Formation’ of early literature) of the Clear Fork Group, Texas; Leonardian (= Artinskian), Lower Permian. CM 73370, 73371, and 76876, and FMNH UR 161 were collected by E. C. Olson from his ‘ Labidosaurus pocket’ locality (Coffee Creek, Baylor County, TX, USA). Specific locality data is missing for MCZ 8727, which was collected by ‘ Chas. H. Sternberg during 1882 in NW Texas’ (C. Schaff, pers. comm., 2005).
Name
- Homonyms
- Labidosaurus hamatus (Cope 1895)