Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) Subkingdom Prymnesiobiotina Doweld (2001) [monotypic] Phylum Prymnesiophyta Hibberd ex Doweld (2001) Class Prymnesiophyceae D.J. Hibberd (1976) see Class Coccolithophyceae Rothm. (1951)