Cephalopoda - Tarphycerida - Estonioceratidae
Full reference: A. Hyatt. 1894. Phylogeny of an acquired characteristic. Proceedings of the American Philosophical Society 32(143):349-647
Parent taxon: Estonioceratidae according to B. Stait 1983
See also Crick 1981, Teichert et al. 1964 and Ulrich et al. 1942
Sister taxa: Aethoceras, Alaskoceras, Aphetoceras, Clytoceras, Deltoceras, Eichwaldoceras, Estonioceras, Shumardoceras, Tragoceras
Subtaxa: Pycnoceras adamsense Pycnoceras apertum Pycnoceras calciferiforme Pycnoceras clausum Pycnoceras rotundatum
Type: Pycnoceras apertum
Ecology: fast-moving nektobenthic carnivore
Distribution:
• Ordovician of Canada (3: Newfoundland, Newfoundland and Labrador collections), United States (10: Arkansas, Missouri)
• Canadian of Australia (1)
Total: 14 collections including 15 occurrences
Specimen images are retrieved through the ePANDDA API.
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