Cephalopoda - Ammonitida

Invalid subtaxa: Prionocyclidae Breistroffer 1947 [replaced name], Prionotropidae Zittel 1865 [replaced name]

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

Sister taxa: Acanthoceratidae, Brancoceratidae, Coilopoceratidae, Flickiidae, Forbesiceratidae, Leymeriellidae, Libycoceratidae, Lyelliceratidae, Prolyelliceratidae, Pseudotissotiidae, Sphenodiscidae, Vascoceratidae

Subtaxa: Barroisiceras, Barroisiceratinae, Benueites, Collignoniceratinae, Paratexanites, Peroniceratinae, Protexanites, Roemeroceras, Texanitinae

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Ecology: fast-moving nektonic carnivore