Quebecoceras is an extinct genus from the nautiloid order Ellesmerocerida

Ellesmerocerida

The Ellesmerocerida is a order of primitive cephalopods belonging to the subclass Nautiloidea with a widespread distribution that lived during the Late Cambrian and Ordovician.-Morphology:...

 that lived during the Gasconadian Stage

Gasconadian Stage

The Gasconadian Stage is the first stage of the Ordovician geologic period in North America and of the Lower Ordovician Canadian Epoch, coming immediately after the Late Cambrian Trempealeauan and preceding the middle Canadian Demingian Stage...

 at the beginning of the Early Ordovician

Ordovician

The Ordovician is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago . It follows the Cambrian Period and is followed by the Silurian Period...

.

Quebecoceras is a cyrtoconic, similar to Dakeoceras

Dakeoceras

Dakeoceras is a simple cyrtoconic ellesmeroceratid genus, all known species of which come from the Lower Canadian of North America....

and Paradakeoceras

Paradakeoceras

Paradakeoceras is an early Ordovician cephalopod belonging to the nautiloid order Ellesmerocerida.- Morphology :The shell of Paradakeoceras is an expanding endogastric cyrtocone with the siphuncle situated near the shell's concave margin....

except for having a circular cross section and more persistent curvature and rate of expansion. Paradakeoceras differs in having a somewhat flattened venter.

The only known species, Quebecoceras quebecense, is half again a large as the largest known Dakeoceras, making it a fairly large ellesmeroceratid genus.