Diademoceras
Diademoceras is a genus of nautiloid cephalopods from the middle Ordovician of North America, named by Rousseau Flower,1945. The genus is a tainoceratacean included in the nautilid family Rutoceratidae.
| Diademoceras Temporal range: Middle Devonian | |
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| Genus: | Diademoceras Flower, 1945 |
The shell of Diademoceras is gyroconic, of no more than two whorls, coiled such that whorls do not touch. Whorls are broad, section depressed, sides converge ventrally meeting at a well developed keel. Ornamentation consists of a series of spines on either side as well as transverse straie which form a well developed hyponomic sinus (for the funnel) on the venter. Sutures are straight across the venter, but form a broad shallow lobe on the dorsum. The siphuncle is close to the venter, composed of straight and empty segments, i.e. orthochoanitic.
References
- Bernhard Kummel 1964. Nautiloidea-Nautilida Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press.