Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - GONIATITIDA [Order] - DIMORPHOCERATOIDEA [Superfamily] ------ Family: GIRTYOCERATIDAE Wedekind, 1918 † (Sea) --------- SubFamily: GIRTYOCERATINAE ------------ Genus: Calygirtyoceras Korn & al., 1999 †
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