Calocyrtoceras

Calocyrtoceras is a genus of orthocerids (Cephalopoda, Nautiloidea), from the middle Silurian of North America (Quebec) and central Europe.

Calocyrtoceras
Temporal range: Middle Silurian
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Orthocerida
Family:
Paraphragmitidae
Genus:
Calocyrtoceras

Foerste 1936

The shell, or conch, of Calocyrtoceras is generally characteristic of its family, the Paraphragmitidae, an anulated cyrtocone. In the case of Calocyrtoceras striated both transversely and longitudinally.

Similar Cyrtocycloceras from the Middle Silurian of Europe is only striated transversely while similar Gaspocyclocas from the Middle Silurian of North America is only striated longitudinally.

References
    • Walter C. Sweet, 1964. Nautiloidea -Orthocerida. Treatise on Invertebrate Paleontology, Part K. Geological Society of America.
    • Calocyrtoceras, Fossilworks, PaleoDB gateway


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