Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - GONIATITIDA [Order] - PRIONOCERATOIDEA [Superfamily] ------ Family: PRIONOCERATIDAE Hyatt, 1884 † (Sea) --------- SubFamily: BALVIINAE ------------ Genus: Prionoceras Sepkoski Jr., 2002 †
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