Class: CEPHALOPODA --- Taxon Tree: NAUTILOIDEA [Subclass] - NAUTILIDA [Order] - TRIGONOCERATOIDEA [Superfamily] ------ Family: GRYPOCERATIDAE Hyatt, 1900 † (Sea) --------- SubFamily: GYRONAUTILINAE ------------ Genus: Stearoceras Hyatt, 1893 †
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