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Class: CEPHALOPODA
--- Taxon Tree: NAUTILOIDEA [Subclass] - ELLESMEROCERIDA [Order]
------ Family: PROTOCYCLOCERATIDAE Kobayashi, 1935 † (Sea) (FOSSIL)
DB counters: Genus=8, Subgenus=0, Species=40, Subspecies=0 ( 3 Species and 0 Subspecies have images)
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Genus: Protocycloceras Hyatt & Zittel, 1900 † (syn: Rhabdocycloceras - DB: 21 SP, 3 IMG)
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