ammonites
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Calycoceras (Calycoceras) boreale Kennedy et al. 1996 (ammonite)

Cephalopoda - Ammonitida - Acanthoceratidae

PaleoDB taxon number: 340526

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) 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 width 26.2, shell diameter 37.4