Species: watsoni EFREMOV, 1946
Etymology: In honor of Prof. David Meredith Seares Watson (1886-1973), British paleontologist.

Holotype: PIN 271/1

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: Fragmentary skull and fragmentary skeleton.
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Species: qualeni EFREMOV, 1946 (nomen dubium)
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