This virtual collection was last curated by Jaleigh Pier on August 16, 2019. 
Each model is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Unless otherwise indicated, each model was created by Emily Hauf using specimens at the Paleontological Research Institution, Ithaca, New York.
An associated page about stem group cephalopods is now available on the Digital Encyclopedia of Ancient Life.
Order Actinocerida
Fossil specimen of the cephalopod Actinoceras beloitense from the Ordovician Platteville Limestone of Ogle County, Illinois (PRI 70326). Specimen is from the collections of the Paleontological Research Institution, Ithaca, New York. Length of specimen is approximately 9 cm.
Order Discosorida
Fossil specimen of the discosorid cephalopod Westonoceras sp. from the Ordovician Galena Formation of Fillmore County, Minnesota (PRI 70364). Specimen is from the collections of the Paleontological Research Institution. Maximum length of specimen (not including surrounding rock matrix) is approximately 5.5 cm.
Order Oncocerida
Fossil specimen of the oncocerid cephalopod Oxygonioceras aequale from the Silurian of Prague, Czech Republic (PRI 70586). Specimen is from the collections of the Paleontological Research Institution. Maximum length of specimen is approximately 9 cm.
Fossil specimen of the oncocerid cephalopod Gomphoceras? sp. from the Silurian of Prague, Czech Republic (PRI 70583). Specimen is from the collections of the Paleontological Research Institution. Maximum length of specimen is approximately 7 cm.