Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Bacillariobiota Doweld (2001) 1 Subkingdom Labyrinthulobiotina Doweld (2001) 2 Subkingdom Saprolegniobiotina Doweld (2001) 3 Subkingdom Bacillariobiotina Doweld (2001) 4 Subkingdom Acanthocystobiotina Doweld, 2001 5 Subkingdom Prymnesiobiotina Doweld (2001) [monotypic]