Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) Subkingdom Prymnesiobiotina Doweld (2001) [monotypic] Phylum Prymnesiophyta Hibberd ex Doweld (2001) Class Pavlovophyceae J.C. Green & Medlin (2000)