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Cephalopod: Casteroceras alternatum (PRI 5363).
Fossil specimen of the nautiloid cephalopod Casteroceras alternatum from the Devonian Marcellus Shale (Cherry Valley Limestone Member) of Madison County, New York (PRI 5363). Specimen is part of the type and figured collections of the Paleontological Research Institution, Ithaca, New York. Model by Emily Hauf.
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