Shelbyoceras

Shelbyoceras
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
(unranked):	Monoplacophora
Order:	†Archinacelloidea
Family:	†Shelbyoceridae
Genus:	†Shelbyoceras

Shelbyoceras is a genus of Cambrian monoplacophora which was one of the genera mistaken for a cephalopod, since the characteristics differentiating monoplacophora from cephalopods are few. Shelbyoceras was reclassified based on a depressed groove that forms a band around the shell, which is similar to a feature seen in Hypseloconus^[1] (with whom it may be synonymous).^[2] The septa in this genus are either closely or irregularly spaced.^[1]

References

1 2 Stinchcomb, B. L. (1980). "New Information on Late Cambrian Monoplacophora Hypseloconus and Shelbyoceras (Mollusca)". Journal of Paleontology. Paleontological Society. 54 (1): 45–49. doi:10.2307/1304159. JSTOR 1304159.
↑ Stinchcomb, B. L.; Echols, D. J. (1966). "Missouri Upper Cambrian Monoplacophora Previously Considered Cephalopods". Journal of Paleontology. 40 (3): 647–650. doi:10.2307/1301748. JSTOR 1301748.

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[Stinchcomb1980-1] 1 2 Stinchcomb, B. L. (1980). "New Information on Late Cambrian Monoplacophora Hypseloconus and Shelbyoceras (Mollusca)". Journal of Paleontology. Paleontological Society. 54 (1): 45–49. doi:10.2307/1304159. JSTOR 1304159.

[2] Stinchcomb, B. L.; Echols, D. J. (1966). "Missouri Upper Cambrian Monoplacophora Previously Considered Cephalopods". Journal of Paleontology. 40 (3): 647–650. doi:10.2307/1301748. JSTOR 1301748.