Actinoceras tenuifilum Location: U.S. National Museum of Natural History, Washington, DC Year: 2009 Merckdigitals catalogue number: 22-70151 Comments: Ordovician, NY

Actinoceras tenuifilum Location: U.S. National Museum of Natural History, Washington, DC Year: 2013 Merckdigitals catalogue number: 22-81914 Comments: Ordovician, NY

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