Cephalopod: Eutrephoceras dekayi (PRI 44557)3D Model
Fossil specimen of the nautiloid cephalopod Eutrephoceras dekayi from the Cretaceous Pierre Shale of the Black Hills of South Dakota (PRI 44557). Specimen is from the collections of the Paleontological Research Institution, Ithaca, New York. Maximum diameter of specimen is approximately 6 cm. Model by Emily Hauf.