Cephalopoda - Ellesmerocerida - Ellesmeroceratidae
Alternative combination: Ellesmeroceras robsonensis
Full reference: C. D. Walcott. 1924. Cambrian and Ozarkian Brachiopoda, Ozarkian Cephalopods and Notostraca. Smithsonian Miscellaneous Collections 67:477-554
Belongs to Robsonoceras according to R. H. Flower 1964
See also Ulrich et al. 1944
Sister taxon: Robsonoceras manitouense
Type specimen: a series of syntypes in the USNM. Its type locality is 61q. Billings Butte, E of Robson Peak, which is in a Stairsian marine horizon in the Chushina Formation of Canada.
Distribution:
• Ordovician of Canada (2: Alberta, British Columbia collections)
• Skullrockian of Canada (1: Alberta)
Total: 3 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.