Eocaptorhinus laticeps (Williston 1909) Artinskian, Early Permian, ~280 mya, ~30+ cm in length, was derived from a sister to Protocaptorhinus and Paracaptorhinus. Eocaptorhrinus preceded Labidosaurus and Captorhinus.

Distinct from Protocaptorhinus, the skull of Eocaptorhinus had a "shark nose" in which the premaxilla was visible in ventral view. The nasals and frontals were subequal in length. The pineal foramen was smaller than a fifth of the length of the parietal. The tabulars were fused to the squamosal. The quadratojugal was gracile or the lateral exposure was minimal. Vomer and parasphenoid teeth were absent. The posterior maxillary tooth extends to mid orbit.

Swollen neural spines are present. Pedal 1.1 aligns with metatarsals II and III.

Heaton MJ 1979. Cranial Anatomy of Primitive Captorhinid Reptiles from the Late Pennsylvanian and Early Permian, Oklahoma and Texas. Oklahoma Geological Survey, Bulletin vol. 127. The University of Oklahoma, Norman, 83 p.

Heaton MJ and Reisz RR 1979. A skeletal reconstruction of the early Permian captorhinid reptile Eocaptorhinus laticeps (Williston). Journal of Paleontology 54: 136-143.

Williston SW 1909. New or Little Known Permian Vertebrates. Pariotichus. Biological Bulletin 17(3):241-255.

wiki/Eocaptorhinus