Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Bacillariobiota Doweld (2001)
       Subkingdom Labyrinthulobiotina Doweld (2001)
         1 Phylum Pseudodendrozoa Doweld, 2001 [monotypic]
         2 Phylum Bicosoecomycota Corliss (1994)
         3 Phylum Labyrinthulomycota F.C. Page (1980)