MolluscaBase source details
Holland, C. H.; Copper, P. (2008). Ordovician and Silurian nautiloid cephalopods from Anticosti Island: traject across the Ordovician–Silurian (O–S) mass extinction boundary. Canadian Journal of Earth Sciences. 45(9): 1015-1038.
509934
10.1139/e08-048 [view]
Holland, C. H.; Copper, P.
2008
Ordovician and Silurian nautiloid cephalopods from Anticosti Island: traject across the Ordovician–Silurian (O–S) mass extinction boundary
Canadian Journal of Earth Sciences
45(9): 1015-1038
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Ephippiorthoceras formosum (Billings, 1857) † (basis of record)