Classification
Phylum: Mollusca
Class: Cephalopoda
Order: Orthocerida
Family: Orthoceratidae M’Coy, 1844
Cincinnatian Genera: Pleurorthoceras, Richmondoceras
Geologic Range
Lower Ordovician – Upper Triassic
Common Paleoecology
Orthoceratidae is an extinct family of nektonic carnivores
Description of the Family
- Smooth or elaborately ornamented
- Subcircular in cross section
- Central or subcentral siphuncle
- Siphuncle free of endosiphuncular deposits
Published Descriptions
Treatise on Invertebrate Paleontology, Part K (1964):
- Smooth or elaborately ornamented, generally subcircular in cross section and with central or subcentral siphuncle that is typically free of endosiphuncular deposits.
Pleurorthoceras
Richmondoceras
