In Depth
Initially thought to be a diapsid, Apsisaurus was later realised to a Eupelycosaurian varnopisd. As a Varanopid, Apsisaurus was related to the more famous Varanops which also lived in Texas at the same approximate time as Apsisaurus.
Further Reading
- The osteology of a Lower Permian eosuchian from Texas and a review of diapsid phylogeny. - Zoological Journal of the Linnean Society 101 (1): 59–95. - Michel Laurin - 1991. - Apsisaurus witteri from the Lower Permian of Texas: yet another small varanopid synapsid, not a diapsid. - Journal of Vertebrate Paleontology 30 (5): 1628–1631. - Robert R. Reisz, Michel Laurin and David Marjanović - 2010.
