Protocaptorhinus pricei (Watson 1954) Artinskian, Early Permian, ~280 mya, ~25 mm skull length, was derived from a sister to Paracaptorhinus and phylogenetically preceded Eocaptorhinus.

Distinct from Paracaptorhinus, the skull of Protocaptorhinus the preorbital and postorbital portions were subequal in length. The medial premaxillary tooth is not larger than the others. No maxillary teeth are twice as long as wide in lateral view and they are blunt.

Above: Two distinctly different specimens, both attributed to Protocaptorhinus. Above P. pricei from Texas (Clark and Carroll 1973). Below P. sp. from Rhodesia (Gaffney and McKenna 1979). Phylogenetic scoring employed the holotype from Texas.

Clark J and Carroll RL 1973. Romeriid reptiles from the Lower Permian. Bulletin of The Museum of Comparative Zoology 144:353-407.

Gaffney ES and McKenna MC 1979. A Late Permian Captorhinid from Rhodesia. American Museum Novitates 2688: 1-15.

Watson, DMS 1954. On Bolosaurus and the origin and classification of reptiles. Harvard College, Museum of Comparative Zoology Bulletin 111:299-449.

wiki/Captorhinidae