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.