Species: progressus (HARTMANN-WEINBERG, 1938) BYSTROW, 1955
Etymology:
= Arctognathus progressus HARTMANN-WEINBERG, 1938
= Inostrancevia progressus (HARTMANN-WEINBERG, 1938) EFREMOV, 1940

Lectotype: PIN 156/5

Locality: Semin Ovrag Locality, Semin (Syomin) Ovrag Ravine, Cemin Ravin, village of Il’inskoe, right bank of the Volga River, Tetyushi District, Tatarstan, European Russia.

Horizon: Serverodvinian (Dvina) horizon, Semen Formation.

Biostratigraphy: Sokolki Faunal Assemblage, Ilinskoe Faunal Subassemblage.

Age: Upper Tatarian Age, Lopingian Subepoch, upper Zechstein Epoch, Late Permian.

Material: Skull.

Referred material:

PIN 156/6: Fragmentary skull, mandible and anterior part of the skeleton.

PIN 156/7, 156/8: Left maxillae.

PIN 156/9, 52-55: Right dentaries.

PIN 156/26: Skull fragment.

PIN 156/38-40: Canines.

PIN 156/51: Half of a skull.

PIN 156/56: Right mandible, ramus.

PIN 156/57: An occiput.

PIN 156/58, 156/59, 156/65: Left squamosals.

PIN 156/60: Postcanine fragment.

PIN 156/67: Right maxilla.

PIN 156/70: Right angular.

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Species: parringtoni (HUENE, 1950) GEBAUER, 2014
Etymology: In honor of British paleontologist Dr. Francis Rex Parrington
= Scymnognathus parringtoni HUENE, 1950
= Aelurognathus? parringtoni (HUENE, 1950) SIGOGNEAU, 1970

Holotype: GPIT/RE/7113 (old IGP U 28)

Locality: Usili-Berges, Ruhuhu Valley, Tanzia, Tanganyika, East Africa.

Horizon: Hoedemaker member, Middle Teekloof Formation.

Biostratigraphy: Tropidostoma zone (Tropidostoma-Endothidon Assemblage zone KEYSER, 1979, SACS, 1980, Tropidostoma microtrema zone KEYSER & SMITH, 1977-78, Lower Cistecephalus zone KITCHING, 1970, 1977, Endothiodon zone, WATSON, 1914).

Age: Tatarian Age, Lopingian Subepoch, Zechstein Epoch, Late Permian.

Material: Skull and dentary and fragmentary skeleton.

Note: Has a dentary of Katumbia parringtoni in its stomach region (MAISCH, 2009).