PaleoDB taxon number: 333416
Full reference: W. J. Kennedy and W. A. Cobban. 1990. Cenomanian micromorphic ammonites from the western interior of the USA. Palaeontology 33:379-422
Type specimen: USNM 423698, a shell. Its type locality is USGS Mesozoic 12650, Thornton, which is in a Cenomanian marine shale in the Belle Fourche Formation of Wyoming.
Ecology: fast-moving nektonic carnivore
Average measurements (in mm): shell width 4.30, shell diameter 12.6