Cephalopoda - Ammonoidea - Pachydiscidae

Full reference: C. E. Macellari. 1986. Late Campanian-Maastrichtian ammonite fauna from Seymour Island (Antarctic Peninsula). The Paleontological Society Memoir 18:1-59

Belongs to Pachydiscus (Pachydiscus) according to C. E. Macellari 1986

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) kamishakensis, Pachydiscus (Pachydiscus) oldhami, Pachydiscus (Pachydiscus) ootacodensis, Pachydiscus (Pachydiscus) subrobustus, Pachydiscus (Pachydiscus) ultimus, Pachydiscus (Pachydiscus) woodringi

Ecology: fast-moving nektonic carnivore