Class: CEPHALOPODA --- Taxon Tree: NAUTILOIDEA [Subclass] - NAUTILIDA [Order] - TAINOCERATOIDEA [Superfamily] ------ Family: GZHELOCERATIDAE Ruzhentsev & Shimanskiy, 1954 † (Sea) ------------ Genus: Tylonautilus Pringle & Jackson, 1928 †
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