Cephalopoda - Ammonitida - Arietitidae
Alternative spellings: Gyrophioceras, Paracaloceras (Gyrophioceras)
Full reference: L.F. Spath. 1924. The ammonites of the Blue Lias. Proceedings of the Geologists’ Association 35:186-211, 18 Pl
Parent taxon: Vermiceras according to M. K. Howarth 2013
See also Bloos 1994, Longridge et al. 2008, Longridge et al. 2008 and Taylor 1998
Sister taxa: Vermiceras (Paracaloceras), Vermiceras (Vermiceras), Vermiceras densicostatum, Metophioceras rotticus, Metophioceras rotarium, Metophioceras janus, Metophioceras galaczi, Metophioceras trigonatum, Metophioceras gracile, Metophioceras bonnardii, Metophioceras conybeari, Protocymbites azzouzi
Subtaxa: Gyrophioceras mineralense Gyrophioceras morganense Gyrophioceras praespiratissimum Gyrophioceras praespiratissimus Gyrophioceras supraspiratum
Type: Arietites praespiratissimus
Ecology: fast-moving nektonic carnivore
Distribution:
• Jurassic of Austria (5 collections), Canada (6: British Columbia), Italy (1), United States (5: Nevada, Oregon)
Total: 17 collections including 18 occurrences