Cephalopoda - Ammonoidea - Nostoceratidae

Alternative combination: Turrilites umbilicatus

Belongs to Didymoceras according to W. J. Kennedy et al. 2000

Sister taxa: Didymoceras angulatum, Didymoceras binodosum, Didymoceras californicum, Didymoceras cheyenense, Didymoceras cheyennense, Didymoceras cochleatus, Didymoceras hornbyense, Didymoceras navarroensis, Didymoceras nebrascense, Didymoceras newtoni, Didymoceras nicolletii, Didymoceras platycostatum, Didymoceras stevensoni, Didymoceras subtuberculatum, Didymoceras tenuicostatus, Didymoceras tortus, Didymoceras tricostatus, Didymoceras uncus, Didymoceras vespertinus

Ecology: fast-moving nektonic carnivore