Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - AMMONITIDA [Order] - HILDOCERATOIDEA [Superfamily] ------ Family: HILDOCERATIDAE Hyatt, 1867 † (Sea) --------- SubFamily: HARPOCERATINAE ------------ Genus: Harpoceras Sowerby, 1820 †
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