Trigonoceras
| Trigonoceras Temporal range: Lower Carboniferous
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|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | Nautilida |
| Family: | †Trigonoceratidae |
| Genus: | †Trigonoceras M'Coy,(1844) |
Trigonoceras is an extinct genus of prehistoric nautiloids from the nautilid family Trigonoceratidae that lived during the Early Carboniferous in what is now western Europe.
Trigonoceras has a very loosely coiled gyroconic or cyrtoconic shell with a subtriangular cross section, as indicated by fragmentary specimens. The venter on the outer rim or convex side is broad and transversely concave with angular shoulders; the sides which converge on a narrow dorsum are broadly convex. The siphuncle is slightly dorsal of the center and is orthochoanitic.(Kummel,B.1964.) A member of the Trigonoceratidae, Trigonoceras is also a component of the superfamily Trigonocerataceae
References
- Kummel,B.1964. Nautiloidea-Nautilida in the Treatise on Invertebrate Paleontology Part K; Geological Society of America and University of Kansas Press
- (Cephalopda) -Sepkoski's Online Genus Database
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