Chouteauceras is an openly coiled, gyroconic, nautiloid cephalopod from the Mississippian of North America belonging to the Nautilid family Trigonoceratidae

Trigonoceratidae

The Trigonoceratidae is a family of coiled nautiloid cephalopods that lived during the period from the Early Carboniferous to the Early Permian.-Diagnosis:...

, and superfamily Trigonocerataceae

Trigonocerataceae

The Trigonocerataceae is a superfamily within the Nautilida that ranged from the Devonian to the Triassic that is thought to have contained the source for the Nautilaceae in which Nautilus is found....

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The whorl section of Chouteauceras is ovate, higher than wide. The surface is covered with numerous longitudinal ridges and fine growth lines. The suture has broad rounded lateral lobes and dorsal and ventral saddles. The siphuncle is small, subcentral.

References

• Kummel, B, 1964; Nautiloidea- Nautilida; Treatise on Invertebrate Paleontology Part K Nautiloidea; Geological Society of America and University of Kansas Press.