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) hornbyense, Pachydiscus (Pachydiscus) jacquoti, Pachydiscus (Pachydiscus) kamishakensis, Pachydiscus (Pachydiscus) oldhami, Pachydiscus (Pachydiscus) ootacodensis, Pachydiscus (Pachydiscus) riccardi, Pachydiscus (Pachydiscus) subrobustus, Pachydiscus (Pachydiscus) ultimus, Pachydiscus (Pachydiscus) woodringi

Ecology: fast-moving nektonic carnivore