Phylum Bigyra Cavalier-Smith, 1998 Subphylum Sagenista Cavalier-Smith, 1995 Class Labyrinthulea Olive ex Cavalier-Smith, 1986 Order Thraustochytrida Sparrow, 1973 - thraustochytrids 1 Family Thraustochytriidae Sparrow ex Cejp, 1959 2 Family Oblongichytriidae Cavalier-Smith, 2012 [monotypic] 3 Family Althorniidae Cavalier-Smith, 2012 [monotypic] 4 Family Diplophryidae Cavalier-Smith, 2012 [monotypic]