Cephalopoda - Ammonitida - Acanthoceratidae
Full reference: W. J. Kennedy, W. A. Cobban, and N. H. Landman. 1996. New records of acanthoceratid ammonoids from the Upper Cenomanian of South Dakota. American Museum Novitates 3161:1-18
Belongs to Calycoceras (Calycoceras) according to W. J. Kennedy et al. 1996
Sister taxa: Calycoceras (Calycoceras) dromense, Calycoceras (Calycoceras) inflatum, Calycoceras (Calycoceras) naviculare
Type specimen: AMNH 44332, a shell. Its type locality is AMNH 3155, Belle Fourche Reservoir, Butte, which is in a Cenomanian marine shale/limestone in the Greenhorn Limestone Formation of South Dakota.
Ecology: fast-moving nektonic carnivore
Average measurements (in mm): shell diameter 37.4
Distribution:
• Cretaceous of United States (2: South Dakota collections)
Total: 2 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.