Class: CEPHALOPODA --- Taxon Tree: AMMONOIDEA [Subclass] - AMMONITIDA [Order] - PERISPHINCTOIDEA [Superfamily] ------ Family: OLCOSTEPHANIDAE Haug, 1910 † (Sea) --------- SubFamily: OLCOSTEPHANINAE ------------ Genus: Olcostephanus Neumayr , 1875 †
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