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In page Intejocerida:

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Flower (1976) pointed out that not only does the Intejocerida contain two groups, one with Intejoceras and Bajkaloceras with central siphuncles, the other with Envencoceras, Padunoceras, and a third genus Rossoceras, but that combining it with the Endocerida in the Endoceratoidea, makes the latter polyphyletic and therefore an invalid taxon.