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
Scientific classification
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Hercocyrtoceras

Foeste, 1927

Hercocyrtoceras is related to other acleisoceratid genera such as Acleistoceras, Amphycyrtoceras, and Ectocyrtoceras.

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