Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - GONIATITIDA [Order] - DIMORPHOCERATOIDEA [Superfamily] ------ Family: DIMORPHOCERATIDAE Hyatt, 1884 † (Sea) --------- SubFamily: DIMORPHOCERATINAE ------------ Genus: Trizonoceras Girty , 1909 †
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