01 Phylum Placozoa Grell, 1971
02 Phylum Gnathostomulida Ax, 1956 - gnathostomulids
03 Phylum Tardigrada Doyère, 1840 - tardigrades
04 Phylum Entoprocta Nitsche, 1869 - entoprocts
05 Phylum Cycliophora Funch & Kristensen, 1995 - cycliophorans
06 Phylum Priapulida Delage & Hérouard, 1897 - priapulids
07 Phylum Kinorhyncha Reinhard, 1887 - kinorhynchs
08 Phylum Loricifera Kristensen, 1983 - loriciferans
09 Phylum Mesozoa van Beneden, 1876 see [unranked] Mesozoa van Beneden, 1876
10 Phylum Acanthocephala Kohlreuther, 1771 - acanthocephalans see [unranked] Acanthocephala Kohlreuther, 1771
11 Phylum Nematomorpha Vejdovsky, 1886 - horsehair worms
12 Phylum Gastrotricha Metschnikoff, 1864 - gastrotrichs
13 Phylum Rotifera Cuvier, 1798 - rotifers see Phylum Syndermata Ahlrichs, 1995
14 Phylum Echiura Sedgwick, 1898 - spoon worms, echiurans see Class Echiura
15 Phylum Sipuncula Rafinesque, 1814 - peanut worms see Class Sipuncula
16 Phylum Pogonophora Johansson, 1937 - beard worms see Family Siboglinidae Caullery, 1914
17 Phylum Hemichordata Bateson, 1885 - hemichordates
18 Phylum Chaetognatha Leuckart, 1854 - chaetognaths
19 Phylum Xenoturbellida Westblad, 1949 see Subphylum Xenoturbellida Westblad, 1949