Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - GONIATITIDA [Order] - SCHISTOCERATOIDEA [Superfamily] ------ Family: CHRISTIOCERATIDAE Nassichuk & Furnish, 1965 † (Sea) ------------ Genus: Christioceras Nassichuk & Furnish, 1965 †
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