"chrysophytes" see [unranked] core chrysophytes
   Class Chrysophyceae Fritsch (1927)
     Order Hydrurales Pascher (1931)
       Family Hydruraceae Rostaf. (1881)
         1 Genus Celloniella Pascher (1929)
         2 Genus Chrysonebula J. Lund (1953)
         3 Genus Hydrurus C.Agardh (1824), nom. cons.
         4 Genus Phaeodermatium Hansgirg (1889)