Genus: Gomphiosauridion SUES & OLSEN, 1993
Etymology: Greek gomphios, "cheek tooth" and Greek, sauridion, "little lizard or reptile."

Species: baileyae SUES & OLSEN, 1993
Etymology: Named for Elisabeth Bailey Sues who found the holotype and many other important tetrapod specimens at the Tomahawk locality.

Holotype: USNM 448630

Locality: USNM locality 39981 (Tomahawk Locality), 0.16 km (0.1 miles) east of the eastern branch of Little Tomahawk Creek along the northeastern side of Old Hundred Road (VA 652), Lat. 77°40’15"N, long 37°27’45"W, Hallsboro 7.5 Minute Quadrangle, near Midlothian, Chesterfield County, Virginia.

Horizon: Tomahawk Member, Turkey Branch Formation, Newark Supergroup.


Age: Early to middle Carnian, Lower Late Triassic Epoch, Late Triassic.

Material: Fragment of a right maxilla with 2 teeth.