Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) Subkingdom Bacillariobiotina Doweld (2001) Phylum Pedinellophyta Moehn ex Doweld (2001) Class Pelagophyceae R.A. Andersen & G.W.Saunders (1993) see Class Dictyochophyceae Silva (1980)