PaleoDB taxon number: 333435
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 423792, a shell. Its type locality is USGS Mesozoic 22871, Alzada, which is in a Cenomanian marine shale in Montana.
Ecology: fast-moving nektonic carnivore