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.