Cephalopoda - Pseudorthocerida

Alternative spelling: Spyroceratinae

Parent taxon: Pseudorthocerida according to B. Kröger 2008

Sister taxon: Pseudorthoceratidae

Subtaxa: Adnatoceras, Allanoceras, Anastomoceras, Atahococeras, Bitaunioceras, Cancellspyroceras, Cryptorthoceras, Cyrtospyroceras, Cyrtothoracoceras, Diagoceras, Dolorthoceras, Eridites, Euloxoceras, Fusicoceras, Geisonoceroides, Gordonoceras, Lopingoceras, Palmeroceras, Petryoceras, Pseudocycloceras, Reticycloceras, Sceptrites, Shikhanoceras, Spyroceras, Suloceras, Tripteroceroides

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Ecology: fast-moving nektonic carnivore