Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - AMMONITIDA [Order] - EODEROCERATOIDEA [Superfamily] ------ Family: POLYMORPHITIDAE Haug, 1887 † (Sea) --------- SubFamily: POLYMORPHITINAE ------------ Genus: Gemmellaroceras Hyatt , 1900 †
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