Genus: Yermakia LOPATIN, MASCHENKO, AVERIANOV, REZVYI, SKUTCHAS & LESHCHINSKIY, 2005
Etymology: In honor of the conqueror of Siberia Ermak Timofeevich (?-1585).

Species: domitor LOPATIN, MASCHENKO, AVERIANOV, REZVYI, SKUTCHAS & LESHCHINSKIY, 2005
Etymology: Latin, domitor, "tamer, conqueror."

Holotype: PM TGU no. 16/6-16

Locality: Shestakovo 1, approximately 55°53’N, 87°55’E, Kemerovo Region, Transbaikalia, Western Siberia, Asian Russia.

Horizon: Ilek Formation.

Biostratigraphy:

Age: Aptian-Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Right dentary fragment with p3, m1-m4, posterior alveolus of the canine, anterior root and filled posterior alveolus of p1 and roots of p2.

Referred material:

PM TGU no. 16/4-8: Isolated right m3.

PM TGU no. 16/5-1: Right dentary fragment with alveoli of m1-m3.

PM TGU no. 16/5-16: Right dentary fragment wiht alveoli of m3-m4.

PM TGU no. 16/5-20: Right dentary fragment with alveoli of i1-m1.

PM TGU no. 16/5-25: Right dentary fragment with i3-p1.

PM TGU no. 16/6-6: Left dentary fragment of c1 adn roots of p1.

PM TGU no. 16/6-9: Right dentary fragment with alveoli c1-p3.

PM TGU no. 16/6-18: Right dentary fragment wiht m3-m4 and fragmentary m2.

PM TGU no. 16/7-6: Left dentary fragment with c1 and alveoli of i1-14.

PM TGU no. 16/7-22: Right dentary fragment with alveoli of i1-m4, partially preserved ascending ramus.

PM TGU no. 16/9-28: Right dentary fragment with p1 and alveoli of i1-i4 and c1.

PM TGU no. 120/9-12: Fragmentary posterior part of the right dentary.

PM TGU no. 120/9-13: Right dentary fragment with alveoli of p3-m4.

PM TGU no. 120/9-17: Right dentary fragment with alveoli of m3-m4.

PM TGU no. 120/9-25: Isolated left m3.

AVERIANOV & LOPATIN, 2008

PM TGU 120/5-Sh1-1: Left upper molar, possibly M2.