Alternative spelling: Ammonoida
Full reference: K. A. v. Zittel. 1884. Handbuch der Palaeontologie. I. Abteilung Paleozoologie. II. Band. Mollusca und Arthropoda (Cephalopoda). 329-522
Parent taxon: Cephalopoda according to A. Pohle et al. 2022
Sister taxa: Actinoceratoidea, Akidocheilus, Anomalosaepiidae, Avramidiscus, Barrandeocerida, Belosaepia, Burronoceras, Coleoidea, Dartoceras, Davidiceras, Desmoceras, Didymoceras, Ectocochlia, Ellesmerocerida, Endoceratoidea, Endocycloceratidae, Erlangericheilus, Gonatocheilus, Hadrocheilus, Irianoceras, Lamellaptychus, Leptocheilus, Mesoteuthoidea, Multiceratoidea, Nautilia, Nautiloidea, Ohioceratidae, Orthoceratoidea, Palaeoteuthis, Plectronoceratia, Plectronocerida, Rhyncholithes, Rhynchoteuthis, Robsonoceratidae, Scaptorrhynchus, Sichunoceras, Stemtonoceratidae, Tarphyceratia, Teratoceroides, Tetrabranchiata, Tillicheilus, Werthenoceras, Yanhecerida
Subtaxa: none
Ecology: fast-moving nektonic carnivore