†subfamily Eurycephalitinae Thierry 1976 (ammonite)
Cephalopoda - Ammonitida - Sphaeroceratidae
Parent taxon: Sphaeroceratidae according to T. P. Poulton and R. L. Hall 2019
See also Arthur et al. 1993 and Parent 2006
Sister taxa: Chondroceras, Eocephalites, Labyrinthoceras, Mayaitinae, Oecoptychoceras, Sphaeroceras
Subtaxa: Araucanites Eurycephalites Iniskinites Lilloettia Stehnocephalites Veranadaites Xenocephalites
Ecology: fast-moving nektonic carnivore
Distribution:
• Temaikan of New Zealand (2 collections)
• Jurassic of Argentina (37), Canada (18: British Columbia), Honduras (1), Mexico (1), United States (44: Alaska, Montana, Wyoming)
Total: 103 collections including 165 occurrences