LIST OF THE RICHARDS SPUR (FORT SILL) TETRAPOD PALEOFAUNA
Stratigraphic chart of the lower Permian (partial)
RICHARDS SPUR MYCTEROSAURUS, PROTOROTHYRIDID, ARAEOSCELID, HUMERUS
Eureptilia
Diapsida-Araeoscelidae
Above: picture of the distal head of a Mycterosaurus humerus A, a protorothyridid humerus B, an araeoscelid humerus C, in dorsal view. The Mycterosaurus humerus, in contrast with the other synapsids, has only a moderately expanded distal head and a distally oriented supinator process, in both araeoscelid and protorothyridid humerus the entepicondyle does not extend laterally, but the araeoscelid one has a distinct ectepicondylar foramen. All from Richards Spur (Dolese Quarry), Comanche Co. Oklahoma. Lower Permian.
Abbreviations: ec, ectepicondile; ecspb, ectepicondylar-supinator process bridge; en, entepicondyle; sp, supinator process.