Hercocyrtoceras is a middle Silurian oncocerid found in Nova Scotia and Quebec. Shells are depressed, irregularly annulated cyrtocones with V-shaped hyponomic sinuses, ornamented by longitudinal and transverse ridges. Position and structure of the siphuncle were unknown as of 1964.
| Hercocyrtoceras Temporal range: Middle Silurian
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| Genus: | Hercocyrtoceras Foeste, 1927
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Hercocyrtoceras is related to other acleisoceratid genera such as Acleistoceras, Amphycyrtoceras, and Ectocyrtoceras.
References edit
- Walter C Sweet, 1964. Nautiloidea - Oncocerida. Treatise on Invertebrate Paleontology. Part K Geological Society of America and University of Kansas Press.