Phylum Bigyra Cavalier-Smith, 1998 Subphylum Sagenista Cavalier-Smith, 1995 Class Labyrinthulea Olive ex Cavalier-Smith, 1986 Order Thraustochytrida Sparrow, 1973 - thraustochytrids Family Althorniidae Cavalier-Smith, 2012 [monotypic] Genus Althorniaᵀ Jones & Alderman, 1972