Genus: Archaeotrigon SIMPSON, 1927
Etymology: Greek, arkhaios, “ancient”and Greek, trigonos, “triangle”: Ancient triangle.

Species: brevimaxillus SIMPSON, 1927
Etymology:

Holotype: USNM 2793

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Fragmentary ramus with LP2 and LM3-4.


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Species: distagmus SIMPSON, 1929
Etymology:

Holotype: YPM 13641

Locality: Reeds YPM Quarry 9, (Mammal Quarry), T22N, R77W, Sec. 12, Como Bluff, Albany County, Wyoming.

Horizon: Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 3.

Age: Upper Part, Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Right lower jaw with m2-3.