Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) Subkingdom Bacillariobiotina Doweld (2001) Phylum Raphidomonadophyta Doweld (2001) Subclass Raphidomonadophycidae Doweld (2001) [monotypic] 1 Order Raphidomonadales Doweld (2001) [monotypic]