†family Cyrtendoceratidae Hyatt 1900 (mollusk)

Cephalopoda - Endocerida - Cyrtendoceratidae

Parent taxon: Endocerida according to R. E. Crick 1981

See also Flower 1958 and Teichert et al. 1964

Sister taxa: Baltoceras pusillum, Botryceratidae, Choreanoceroides, Endoceratidae, Eocameroceras, Hoyoceras, Pronajaceras, Proterocameroceratidae, Thylacoceratidae, Trinitoceras, Yehlioceras, Yorkoceratidae

Subtaxa: Cyclocyrtendoceras Cyrtendoceras Cyrtovaginoceras

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Ecology: nektobenthic carnivore

Distribution:

• Chazyan of United States (1: New York collection)

• Arenig of China (7)

• Dawan of China (1)

• Ordovician of Norway (1), Sweden (1)

Total: 11 collections each including a single occurrence

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