Rhaeboceras

Rhaeboceras; Temporal range: Cretaceous
	Fossil of Rhaeboceras halli from the Upper Cretaceous period from the Bearpaw Shale Formation, Fergus County, Montana, United States
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	† Ammonoidea
Order:	† Ammonitida
Suborder:	† Ancyloceratina
Family:	† Scaphitidae
Subfamily:	† Scaphitinae
Genus:	† Rhaeboceras ; Meek 1876
Species
	†R. burkholderi; Cobban, 1987; †R. cedarense; Grier and Grier, 2015; †R. robustus; Warren, 1934;

Last updated January 08, 2026

Rhaeboceras is an extinct genus of ammonite belonging to the subfamily Scaphitinae. Species belonging to the genus lived during the Cretaceous and have been found in the Pierre Shale of North America.^[1]^[2]^[3]

Taxonomy

There are currently three species belonging to this genus:

- Rhaeboceras burkholderi(Cobban, 1987)

- Rhaeboceras cedarense(Grier and Grier, 2015)

- Rhaeboceras robustus(Warren, 1934)

The genus Ponteixites is currently deemed a junior synonym of Rhaeboceras, with most specimens formerly assigned to Ponteixites appearing to be juveniles. The finding of a larger fossil specimen assigned to P. robustus similar to these juvenile remains provides evidence supporting this lumping.^[2]

References

1 2 "Rhaeboceras Meek 1876 (ammonite)". Fossilworks. Macquarie University. 2007. Retrieved 17 December 2021.
1 2 Grier, J. W.; Grier, J. C.; Larson, N. L.; Petersen, J. G. (2007-12-01). "Synonymy of the ammonite genus Ponteixites Warren with Rhaeboceras Meek" . Rocky Mountain Geology. 42 (2): 123–136. doi:10.2113/gsrocky.42.2.123. ISSN 1555-7332.
↑ Grier, Joyce C.; Grier, James W. (May 1998). "New findings of the ammonite Rhaeboceras, including a new species, from the Pierre Shale of eastern Montana" . Journal of Paleontology. 72 (3): 473–476. doi:10.1017/S0022336000024227. ISSN 0022-3360. S2CID 130705667.

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[fossilworks-1] 1 2 "Rhaeboceras Meek 1876 (ammonite)". Fossilworks. Macquarie University. 2007. Retrieved 17 December 2021.

[:0-2] 1 2 Grier, J. W.; Grier, J. C.; Larson, N. L.; Petersen, J. G. (2007-12-01). "Synonymy of the ammonite genus Ponteixites Warren with Rhaeboceras Meek" . Rocky Mountain Geology. 42 (2): 123–136. doi:10.2113/gsrocky.42.2.123. ISSN 1555-7332.

[3] Grier, Joyce C.; Grier, James W. (May 1998). "New findings of the ammonite Rhaeboceras, including a new species, from the Pierre Shale of eastern Montana" . Journal of Paleontology. 72 (3): 473–476. doi:10.1017/S0022336000024227. ISSN 0022-3360. S2CID 130705667.

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