Cephalopoda - Ammonoidea - Pachydiscidae
Full reference: D.L. Jones. 1963. Upper Cretaceous (Campanian and Maestrichtian) ammonites from southern Alaska. United States Geological Survey Professional Paper (432)
Belongs to Pachydiscus (Pachydiscus) according to DL Jones 1963
Sister taxa: Pachydiscus (Pachydiscus) arkansanus, Pachydiscus (Pachydiscus) colligatus, Pachydiscus (Pachydiscus) epiplectus, Pachydiscus (Pachydiscus) gardneri, Pachydiscus (Pachydiscus) gollevillensis, Pachydiscus (Pachydiscus) hazzardi, Pachydiscus (Pachydiscus) hornbyense, Pachydiscus (Pachydiscus) jacquoti, Pachydiscus (Pachydiscus) oldhami, Pachydiscus (Pachydiscus) ootacodensis, Pachydiscus (Pachydiscus) riccardi, Pachydiscus (Pachydiscus) subrobustus, Pachydiscus (Pachydiscus) ultimus, Pachydiscus (Pachydiscus) woodringi
Type specimen: Its type locality is USGS Loc16398, Matanuska Valley-Nelchina [Matanuska Fm], which is in a Campanian marine siltstone/shale in the Matanuska Formation of Alaska.
Ecology: fast-moving nektonic carnivore