Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) Subkingdom Bacillariobiotina Doweld (2001) Phylum Fucophyta Pax (1904) see Phylum Phaeophyta Kjellman (1891) Class Dictyotophyceae Engl. (1892) Subclass Ectocarpophycidae Doweld (2001)