Shelbyoceras

Shelbyoceras
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	incertae sedis
Family:	† Scenellidae
Genus:	† Shelbyoceras ; Ulrich & Foerste, 1931
Type species
	Shelbyoceras robustum; Ulrich & Foerste, 1936
Species
	S. bigpineyensisStinchcomb, 1986; S. buttsiUlrich et al., 1943 ; S. robustumUlrich & Foerste, 1936 ; S. unguliformeUlrich et al., 1943 ;

Last updated March 12, 2026

Shelbyoceras is a genus of Cambrian molluscs 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 ^[2] (with whom it may be synonymous).^[3] The septa in this genus are either closely or irregularly spaced.^[2]

References

↑ Stinchcomb, B. L. (1986). "New Monoplacophora (Mollusca) from Late Cambrian and Early Ordovician of Missouri". Journal of Paleontology. 60 (3): 606–626. doi:10.1017/s0022336000022149.
1 2 Stinchcomb, B. L. (1980). "New Information on Late Cambrian Monoplacophora Hypseloconus and Shelbyoceras (Mollusca)". Journal of Paleontology. 54 (1). Paleontological Society: 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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[1] Stinchcomb, B. L. (1986). "New Monoplacophora (Mollusca) from Late Cambrian and Early Ordovician of Missouri". Journal of Paleontology. 60 (3): 606–626. doi:10.1017/s0022336000022149.

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

[3] 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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