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 (with whom it may be synonymous). The septa in this genus are either closely or irregularly spaced.
- 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. k
- 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.