Species: ivakhnenkoi TATARINOV, 1999
Etymology: In honor of paleontologist M. F. Ivakhnenko.

Holotype: PIN 2212/61

Locality: Kotel’nich locality, Kotel’nichskii District, Kirov Region, Eastern European Russia.

Horizon: Tatarian Series, Upper Severodvinian Substage, Severodvinian Horizon.

Biostratigraphy: Sokolki Faunal Assemblage, Kotelnich Faunal Subassemblage, Zone IV.

Age: Lowermost part of the Upper Tatarian Age, Lopingian Subepoch, upper Zechstein Epoch, Late Permian.

Material: Skull with attached proatlas, atlas, and epistropheus, with one side having the sclerotic ring.

Referred material:

IVAKHNENKO, 2003

Locality: Port Kotelnich locality, Kotelnichskii District, Vyatka River, Kirov Region, European Russia.

Horizon: Tatarian Series, Upper Severodvinian Substage, Severodvinian Horizon.

Biostratigraphy: Sokolki Faunal Assemblage, Kotelnich Faunal Subassemblage.

Age: Lower part of the Upper Tatarian Age, Lopingian Subepoch, upper Zechstein Epoch, Late Permian.

Material:

PIN 4678/5: Skull.