Walcottoceras Temporal range: Early Ordovician PreꞒ Ꞓ O S D C P T J K Pg N

Walcottoceras monsense
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	†Ellesmerocerida
Family:	†Protocycloceratidae
Genus:	†Walcottoceras Ulrich & Foerste 1936

Walcottoceras is a genus of cephalopods from the Lower Ordovician included in the ellesmerocerid family Protocycloceratidae according to Rousseau Flower in 1964.

The shell of Walcottoceras is small, slender, compressed, with prominent annuli (complete encircling ribs or costae); may be straight or slightly endogastric. Could be said to be an annulate Ectenolites.

Walcottoceras has been found in the Lower Ordovician of British Columbia, Alberta, Utah, and New York.

References

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Rousseau H Flower, 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda), Memori 12. State Bureau of Mines and Mineral Resourecues. Socorro, New Mexico
Walcottoceras Fossilworks 16 Oct 2014.
Jack Sepkoski, 2000. List of cephalopod genera