Species: riabinini BOLOTSKY & KURZANOV, 1991
Etymology: In honor of Anatolii Nikolaevich Riabinin.

Holotype: AEHM 1/12

Locality: Upper part of Nagornaia Street, southern part of the city Blagoveshchensk, 50°16'07.63"N, 127°28'50.24"E, Amur Province, Asian Russia.

Horizon: Lower section of the Tsagayan Formation, (Tsagayanskaya Svita).

Biostratigraphy: Wodehouseia spinata--Aquilapollenites subtilis palynozone.

Age: Middle Maastrichtian Stage, uppermost Senonian subepoch, Gulf Epoch, Late Cretaceous.

Material: Associated left maxilla and dentary.

Referred material:

GODEFROIT, BOLOTSKY & VAN ITTERBEECK, 2004

Bonebed:

AEHM 1/42: Right quadrate.

AEHM 1/90 (IRSNB R 281): Braincase.

AEHM 1/112: Left jugal.

AEHM 1/232 (IRSNB R 279): Fragmentary upper posterior portion of skull.

AEHM 1/240: Right squamosal.

AEHM 1/263: Left pubis.

AEHM 1/264: Left ilium.

AEHM 1/265: Right femur.

AEHM 1/266: Left fibula.

AEHM 1/267: Left ulna.

AEHM 1/268: Left radius.

AEHM 1/269: Left ischium.

AEHM 1/271: Right coracoid.

AEHM 1/272: Right sternum.

AEHM 1/273: Left scapula.

AEHM 1/274: Left astragalus.

AEHM 1/275: Cranial cervical vertebra.

AEHM 1/278: Right humerus.

AEHM 1/283: Right 3rd proximal phalanx.

AEHM 1/284: Left metatarsal II.

AEHM 1/285: Right metatarsal III.

AEHM 1/286: Right metatarsal.

AEHM 1/292: Right 2nd proximal phalanx.

AEHM 1/294: Right 4th proximal phalanx.

AEHM 1/296: Partial sacrum.

AEHM 1/297-299: 3 articulated dorsal vertebrae.

AEHM 1/304-307: 4 articulated caudal vertebrae.

AEHM 1/969: Left tibia.

BERTOZO, BOLOTSKY, BOLOTSKY, POBEREZHSKIY, RUFFELL, GODEFROIT & MURPHY, 2022

AEHM 1/1037: A pathologic right ulna.

BOLOTSKY, GODEFROIT, BOLOTSKY, AND AUTCHIN, 2014

AEHM 1/1038: Premaxilla.

AEHM 1/1682: Predentary.

AEHM 1/1715, 1/1716: Sacra.

AEHM 1/1755: Left humerus.

LAUTERS, VERCAUTEREN, BOLOTSKY & GODEFROIT, 2013

AEHM 1/233 (IRNSB R 280): Endocast.