†Tarrantoceras (Sumitomoceras) Matsumoto 1969 (ammonite)
Cephalopoda - Ammonitida - Acanthoceratidae
Alternative spelling: Sumitomoceras
Parent taxon: Tarrantoceras according to A. S. Gale et al. 2019
See also Cobban 1988, Cooper 1978, Kennedy and Cobban 1990 and Wright et al. 1996
Sister taxa: Tarrantoceras (Tarrantoceras), Tarrantoceras cuspidum, Tarrantoceras exile, Tarrantoceras flexicostatum
Subtaxa: Sumitomoceras bentonianum Sumitomoceras conlini Tarrantoceras (Sumitomoceras) faustum
Type: Sumitomoceras faustum
Ecology: fast-moving nektonic carnivore
Distribution:
• Cretaceous of United States (12: Arizona, Colorado, Montana, New Mexico, Texas collections)
Total: 12 collections each including a single occurrence