Phylum Bigyra Cavalier-Smith, 1998
   Subphylum Sagenista Cavalier-Smith, 1995
     Class Labyrinthulea Olive ex Cavalier-Smith, 1986
       Order Thraustochytrida Sparrow, 1973 - thraustochytrids
         Family Thraustochytriidae Sparrow ex Cejp, 1959
           1 Genus Thraustochytrium Sparrow, 1936
           2 Genus Ulkenia Gaertn., 1977
           3 Genus Schizochytrium Goldst. & Belsky, 1964
           4 Genus Japonochytrium Kobayasi & Ôkubo, 1953
           5 Genus Aurantiochytrium Yokoy. & Honda, 2007
           6 Genus Sicyoidochytrium Yokoy., Salleh & Honda, 2007
           7 Genus Parietichytrium Yokoy., Salleh & Honda, 2007
           8 Genus Botryochytrium Yokoy., Salleh & Honda, 2007