Genus: Lanthaniscus IVAKHENKO, 1980
Etymology:

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: