Species: efremovi VJUSHKOV, 1955
Etymology: In honor of Ivan E. Efremov.
Holotype: PIN 157/19
Locality: Isheevo Locality, Kamennyi Ravine, left bank of Ulema River, tributary of Sviaga River, 7 km from Isheevo-Nikiforovo Village, Apastovskii (Apostov) District, Tartstan (Tartar), SSSR, European Russia.
Horizon: Urzhumian Stage, Urzhumian Horizon (Dinocephalian Complex).
Biostratigraphy: Isheevo Faunal Assemblage, Isheevo Faunal Subassemblage, Zone II.
Age: Lower Tatarian Substage, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material: Parietal bones.
Referred material:
PIN 157/20:
PIN 157/21:
PIN 157/22:
PIN 157/23:
PIN 157/497:
PIN 157/488:
PIN 157/489: