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