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by DigitalAtlasOfAncientLife in nature-plants
Fossil specimen of the orthocerid cephalopod *Treptoceras* cf. *duseri* from the Ordovician Richmondian Stage of Cincinnati, Ohio (PRI 45492). Specimen is from the collections of the Paleontological Research Institution. Maximum length of specimen is approximately 17 cm. Model by Emily Hauf.