†Protanisoceras (Torquistylus) Casey 1961 (ammonite)
Cephalopoda - Ammonitida - Anisoceratidae
Parent taxon: Protanisoceras according to Casey 1961
Sister taxa: Protanisoceras (Heteroclinus), Protanisoceras (Protanisoceras), Protanisoceras acteon, Protanisoceras blancheti
Subtaxa: none
Ecology: fast-moving nektonic carnivore
Distribution: found only at Marerano (Cretaceous of Madagascar)