Alternative spellings: Orthocerataceae, Orthocerataceae, Orthoceratia
Synonyms: Orthoceratida Zhuravleva 1994, Orthoceratoidea Zhuravleva 1994
Parent taxon: Cephalopoda according to A. Pohle et al. 2022
See also Chen et al. 1981, Evans 1994, Evans 1996, Evans 2005, King and Evans 2019, Kröger and Evans 2011, Kröger and Lefebvre 2012, Sweet 1964 and Teichert 1967
Sister taxa: Actinoceratoidea, Akidocheilus, Ammonoidea, Anomalosaepiidae, Avramidiscus, Barrandeocerida, Belosaepia, Burronoceras, Coleoidea, Dartoceras, Davidiceras, Desmoceras, Didymoceras, Ectocochlia, Ellesmerocerida, Endoceratoidea, Endocycloceratidae, Erlangericheilus, Gonatocheilus, Hadrocheilus, Irianoceras, Lamellaptychus, Leptocheilus, Mesoteuthoidea, Multiceratoidea, Nautilia, Nautiloidea, Nautilus (Solenochilus), Ohioceratidae, Palaeoteuthis, Plectronoceratia, Plectronocerida, Rhyncholithes, Rhynchoteuthis, Robsonoceratidae, Scaptorrhynchus, Sichunoceras, Stemtonoceratidae, Tarphyceratia, Teratoceroides, Tetrabranchiata, Tillicheilus, Werthenoceras, Yanhecerida
Subtaxa: Actinocerida Dissidocerida Lituitida Offleyoceratidae Orthoceras acum Orthoceras austriacum Orthoceras baconicum Orthoceras billiemense Orthoceras blakei Orthoceras celticum Orthoceras increscens Orthoceras indoaustralicum Orthoceras lateseptatum Orthoceras lennaense Orthoceras mojsisovicsi Orthoceras multilabiatum Orthoceras nodosum Orthoceras pulchellum Orthoceras pulchristriatum Orthoceras rotundulum Orthoceras sandlingense Orthoceras shastense Orthoceras spitiense Orthoceras styriacum Orthoceras subellipticum Orthoceras subtiliseptatum Orthoceras triadicum Orthoceras variestriatum Orthocerida Paraphragmitidae Protobactritidae Pseudorthocerida Riocerida Slemmestadoceras