Genus: Rileymillerus BOLT & CHATTERJEE, 2000
Etymology: In honor of Riley C. Miller, who generously permitted the junior author to collect at the Post Quarry.

Species: cosgriffi BOLT & CHATTERJEE, 2000
Etymology: In honor of the late John Cosgriff, a lifelong student of Triassic temnospondyls.

Holotype: TTU P 9168

Locality: Post Quarry, lat 33°31’17”N, long. 101°18’54”W, 14.5 km southeast of Post, R. C. Miller Ranch, Garza County, Texas.

Horizon: Cooper Canyon Member, Dockum Formation.

Biostratigraphy:

Age: Early Norian Epoch, Middle Late Triassic Epoch, Late Triassic.

Material: Fragmentary skull and dentary missing the tip.