Genus: Notosyodon CHUDINOV, 1968
Etymology: Greek, notos, “south”, and Syodon: Southern hog tooth.
Species: gusevi (CHUDINOV, 1968) IVAKHENKO,
= Syodon gusevi (CHUDINOV, 1968) IVAKHENKO, 2003
Holotype: PIN 2505/1
Locality: Zhaksy-Kargala Locality, right bank of the Zhaksy-Karagala River Bank near Aktyubinsk, 7-8 km south of the village of Turazhol, Aktyubinsk Province, Kazahkstan.
Horizon: Biarmian Series, Urzhumian Stage, Urzhumian Horizon.
Biostratigraphy: Isheevo Faunal Assemblage, Malaya Kinel Faunal Subassamblage.
Age: Lower Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
Material: Posterior portion of skull.
PIN 2505/2: 3rd right lower incisor.
PIN 2505/3: 4th or 5th upper left postcanine.
Locality: Right bank of the Donguz River, opposite the Dolmatovskiy Farm in Sol-Iletsk district of Orenburg oblast, European Russia.
Age: Lower part of the Upper Tatarian Age, Capitanian Stage, Middle Zechstein Epoch, Late Middle Permian.
PIN 2608/1: Fragmentary left dentary.