Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - AMMONITIDA [Order] - ACANTHOCERATOIDEA [Superfamily] ------ Family: ACANTHOCERATIDAE Grossouvre, 1894 † (Sea) --------- SubFamily: ACANTHOCERATINAE ------------ Genus: Calycoceras Hyatt , 1900 †
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