''Aphelaeceras'' is an extinct genus from the nautilid family

Trigonoceratidae The Trigonoceratidae is a family of coiled nautiloid cephalopods that lived during the period from the Early Carboniferous ( Mississippian) to the Early Permian. Diagnosis Trigonoceratidae comprise members of the order Nautilida characterized ...

which is part of the Trigonocerataceae, that lived during the Mississippian Period in the late Paleozoic. Aphelaeceras'' is evolute, compressed, with a wide umbilicus and small dorsal impression. Whorl section is subrectangular with convex sides that slope toward a concave venter. Ventral shoulder are subangular, umbilical shoulders broadly rounded. The suture has a narrow ventral lobe and broad lateral lobes. The siphuncle is barely ventral from the center. ''Aphelaeceras'' has been found in

Mississippian Mississippian may refer to: * Mississippian (geology), a subperiod of the Carboniferous period in the geologic timescale, roughly 360 to 325 million years ago * Mississippian cultures, a network of precontact cultures across the midwest and Easte ...

(L. Carb) strata in

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

and

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

. The genus was named by Hyatt, 1844. The type, ''A. difficile'' (DeKoninck) came from

Belgium Belgium, officially the Kingdom of Belgium, is a country in Northwestern Europe. Situated in a coastal lowland region known as the Low Countries, it is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeas ...

. '' Mesochasmoceras'', from the Lower Carboniferous of Europe is similar in having a concave venter but early whorls are nearly ovate in cross section and the umbilicus has a wide perforation.

References

* Kummel, B, 1964; Nautiloidea- Nautilida;

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...

Part K Nautiloidea; Geological Society of America and University of Kansas Press. * Flower, R.H and Kummel, B. 1950; A Classification of the Naulioidea; Journal of Paleontology, V 24, no 5. pp604–616, Sept 1950 {{Taxonbar, from=Q4779533 Prehistoric nautiloid genera