Genus: Miccylotyrans SIMPSON, 1927
Etymology: Greek, mikkylos, “very small” and Greek, tyranus, “tyrant”: Tiny tyrant.

Species: minimus SIMPSON, 1927
Etymology:

Holotype: USNM 2754

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: Left upper jaw with C, M4-6 and alveoli.