Class Choanoflagellatea Cavalier-Smith, 1998 Order Acanthoecida Cavalier-Smith, 1997 Family Acanthoecidae Norris, 1965 1 Genus Acanthoecaᵀ Ellis, 1930 2 Genus Helgoeca Leadbeater, 2008 3 Genus Polyoeca Kent, 1880 4 Genus Savillea Ellis, 1930