Brevicoceras is an extinct nautiloid genus from the order Oncocerida[1] with wide distribution in the Middle Devonian in Eastern North America, Russia and Morocco.

[2] Nautiloids form a broad group of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species in two genera.

Brevicoceras produced short, breviconic, shells in which the ventral side of the phragmocone, or chambered part, is longitudinally convex in profile and the opposite dorsal side concave, resulting in their being exograstric - i.e. upwardly curved.

The shell reaches its maximum width near the front of the phragmocone or rear of the living chamber.

[2] The siphuncle located close to the ventral margin is slender with short expanded segments that give it a nummuloidal or beaded appearance, and contains irregular blade-like actinosiphonate deposits.