ammonites
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Didymoceras nebrascense Meek and Hayden 1856 (ammonite)

Cephalopoda - Ammonoidea - Nostoceratidae

Alternative combinations: Ancyloceras nebrascensis, Cirroceras nebraskense, Helicoceras nebrascense, Heteroceras nebrascense, Nostoceras (Didymoceras) nebrascense, Turrilites nebrascensis

Synonyms: Emperoceras beecheri Hyatt 1894, Emperoceras simplicostatum Whitfield 1902, Heteroceras simplicostatum Whitfield 1902

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 newtoni, Didymoceras nicolletii, Didymoceras platycostatum, Didymoceras stevensoni, Didymoceras subtuberculatum, Didymoceras tenuicostatus, Didymoceras tortus, Didymoceras tricostatus, Didymoceras umbilicatus, Didymoceras uncus, Didymoceras vespertinus

Ecology: fast-moving nektonic carnivore