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others being the Plectronoceratoidea (= Ellesmeroceratoidea of some) from which the others are derived, the Endoceratoidea, Actinoceratoidea, Discosoratoidea, and Nautilitoidea.

Current classifications (e.g. Kröger 2008 and Teichert 1980) separate orthoceratoids, endocerids and actinocerids as co-equal taxa to the Nautiloidea, which becomes much

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