Alternative combinations: Palaeocastor gradatus, Steneofiber gradatus
Full reference: E. D. Cope. 1878. On some of the characters of the Miocene fauna of Oregon. Proceedings of the American Philosophical Society 18(102):63-78
• Oligocene of United States (13: South Dakota)
Total: 22 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.