Cephalopoda - Ammonitida - Sphenodiscidae

Parent taxon: Sphenodiscidae according to W. J. Kennedy et al. 1997

Sister taxa: Eulophoceras, Manambolites

Subtaxa: Sphenodiscus aberrans, Sphenodiscus binkhorsti, Sphenodiscus brasiliensis, Sphenodiscus intermedius, Sphenodiscus lenticularis, Sphenodiscus lobatus, Sphenodiscus parahybensis, Sphenodiscus pleurisepta, Sphenodiscus prepleurisepta, Sphenodiscus ubaghsi

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Ecology: fast-moving nektonic carnivore