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 Genus Thraustochytrium Sparrow, 1936