Species: efremovi IVAKHENKO, 1980
Etymology: In honor of Ivan E. Efremov.
Holotype: PIN 3706/9
Locality: Peza-1 (Pyoza-1), Peza River, right tributary of Mezen' River, Arkhangelska Region, Mezenskii (Mezen) District, European Russia.
Horizon: Biarmian Series, Upper Kimzha beds, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Lower Tatarian Age, Lopingian Subepoch, upper Zechstein Epoch, Late Permian.
Material: Fragmentary skull and fragmentary skeleton.
Referred material:
IVAKHENKO, 2008b
Locality: Nyisagora locality, 4543/n, on the Mezen River, near the juction with the Vashka River, Leshukonskii District, Arkhangelsk Region, European Russia.
Horizon: Biarmian Series, Urzhumian Stage, Urzhumian Horizon, Zone II.
Biostratigraphy: Mezen Faunal Assemblage.
Age: Earliest early Tatarian Age, Guadelupian Stage, Middle Zeichstein Epoch, Middle Permian.
Material:
Numbers: Not given: