Bolosaurus striatus (Cope 1878, Watson, 1954, Jenkins et al 2024, AMNH 4320, 4321, 4462, 4324, 4326, 4327) Cisuralian, Early Permian ~294 mya, ~2.5 cm skull length was originally considered a pelycosaur like Dimetrodon, but the lateral temporal fenstra they both share was by convergence. Bolosaurus was a sister to Phonodus and Belebey. Bolosaurids nested with diadectids.

Distinct from Belebey, the skull of Bolosaurus had a taller profile dominated by the large orbit. The maxilla was ventrally concave. The jugal was not so embayed by the lateral temporal fenestra. The postorbital reached the posterior margin of the skull.

The neural spines were inflated.

Bolosaurus major (AMNH 4461) is larger with much larger (+20%) teeth with higher crowns.

Eudibamus was considered a bolosaurid, but it is not related. Bolosaurid sisters all had bulky bodies and short limbs, not the lean, long-limbed morphology of Eudibamus.

Cope ED 1878. Descriptions of extinct Batrachia and Reptilia from the Permian formations of Texas. Proceedings of the American Philosophical Society 17:505-530

Case EC 1907. Description of the Skull of Bolosaurus striatus Cope. Bulletin of the American Museum of Natural History 23:653-658

Broom R 1913. On the Structure and Affinities of Bolosaurus. Bulletin of the American Museum of Natural History 32:509-516.

Jenkins KM et al (5 co-authors) 2024. Cranial anatomy and phylogenetic affinities of Bolosaurus major, with new information on the unique bolosaurid feeding apparatus and evolution of the impedance-matching ear. The Anatomical Record @ ResearchGate.net

Watson DMS 1954. On Bolosaurus and the origin and classification of reptiles.Bulletin of the Museum of Comparative Zoology at Harvard College,, v. 111, no. 9444-449.

wiki/Bolosaurus