Genus: Choyrodon GATES, TSOGTBAATAR, ZANNO, TSOGTBAATAR, & WATABLE, 2018
= Nova GATES, TSOGTBATAAR, & ZANNO, 2008
Etymology: Choyr, a city near the Khuren Dukh locality where the taxon was discovered, and Latin, don, 'tooth'; a common ending for onrithopd dinosaurs.

Species: barsboldi GATES, TSOGTBAATAR, ZANNO, TSOGTBAATAR, & WATABLE, 2018
Etymology: In honor of Dr. Rinchen Barsbold, a leading paleontologist of Mongolia and leader of the paleontology expedition that discovered the first remins of the species.

Holotype: MPC-D100/801

Locality: Khuren Dukh (Xypeh Dyx), northwestern Dornogov’ (East Gobi Province), approximately 30 km South of the town of Choir (Choyr), Mongolia.

Note: Exact locality information is on file at the MPC.

Horizon: Lower member, Khuren Dukh Formation (‘Khukhtekian’ age).

Biostratigraphy:

Age: Middle-Late Albian Stage, Middle Gallic Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material: A partial disarticulated skull containing right and left premaxillae, right maxilla, right ectopterygoid, right palatine, left pterygoid, right and left jugals, right and left lacrimals, right nasal, nearly complete skull roof (including frontals, a single prefrontal (right?), postorbitals, squamosals, parietals, laterosphenoids, orbitosphenoids, prootics, exoccipitals, opisthotics, and supraoccipital), right and left quadratojugals, right quadrate, right and left dentaries, partial predentary, right and left surangulars, right and left angulars, metacarpals, and cervical ribs.

Skull modified from GATES, TSOGTBAATAR, ZANNO, TSOGTBAATAR, & WATABLE, 2018.

Referred material:

MPC-D 100/800: A partial disarticulated skull and fragmentary postcranial skeleton containing right and left premaxillae, right and left nasals, right quadrate, quadratojugal (unknown side), a nearly complete skull roof missing prefrontals and squamosals, right surangular, partial predentary, left sternal rib and neural spine.

MPC-D 1000/803: A fragmentary skull and partial postcranial skeleton with left nasal, left scapula, left coracoid, left radius, left ulna, partial manus, vertebrae, ribs, partial left pubis, left ischium, partial left ilium, right femur, and partial left tibia.