†family Gastrioceratidae Hyatt 1884 (ammonite)
Parent taxon: Gastrioceratoidea according to W. M. Furnish et al. 2009
Sister taxa: Glaphyritidae, Homoceratidae, Reticuloceratidae
Subtaxa: Cancelloceras, Chaerogastrioceras, Gastrioceras, Owenoceras
Type: Gastrioceras
Ecology: fast-moving nektonic carnivore