1 - Introduction and Systematics
2 - Anatomy
3 - Protodrilida Pettibone, 1982
4 - Polygordius Schneider, 1868
5 - Eulepethidae Chamberlin, 1919
6 - Aphroditidae Malmgren, 1867
7 - Sigalionidae Kinberg, 1856
8 - Acoetidae Kinberg, 1856
9 - Iphionidae Kinberg, 1856
10 - Polynoidae Kinberg, 1856
11 - Syllidae Grube, 1850
12 - Nephtyidae Grube, 1850
13 - Pilargidae Saint-Joseph, 1899
14 - Chrysopetalidae Ehlers, 1864
15 - Hesionidae Grube, 1850
16 - Nereididae Johnston, 1865
17 - Microphthalmidae Hartmann-Schröder, 1971
18 - Glyceroidea Fauchald, 1977
19 - Sphaerodoridae Malmgren, 1867
20 - Tomopteridae Johnston, 1865
21 - Lacydonia Marion, 1874
22 - Typhloscolecidae Uljanin, 1878
23 - Lopadorrhynchidae Claparède, 1868
24 - Phyllodocidae Örsted, 1843
25 - Paralacydonia Fauvel, 1913
26 - Phyllodocida incertae sedis
27 - Lumbrineridae Schmarda, 1861
28 - Oenonidae Kinberg, 1865
29 - Eunicidae Berthold, 1827
30 - Onuphidae Kinberg, 1865
31 - Dorvilleidae Chamberlin, 1919
32 - Histriobdellidae Claus Moquin-Tandon, 1884
33 - Hartmaniella Imajima, 1977
34 - Spinther Johnston, 1845
35 - Myzostomida Graff, 1877
36 - Aberranta Wolf, 1987
37 - Nerillidae Levinsen, 1883
38 - Sabellidae Latreille, 1825
39 - Serpulidae Rafinesque, 1815
40 - Fabriciidae Rioja, 1923
41 - Sabellariidae Johnston, 1865
42 - Spionidae Grube, 1850
43 - Aeolosomatidae Levinson, 1884
44 - Hrabeiella Pizl and Chalupsky, 1984
45 - Clitellata Michaelsen, 1919
46 - Opheliidae Malmgren, 1867
47 - Thalassematidae Forbes, Goodsir, 1841
48 - Capitellidae Grube, 1862
49 - Scalibregmatidae Malmgren, 1867
50 - Maldanidae Malmgren, 1867
51 - Arenicolidae Johnston, 1835
52 - Pectinariidae Quatrefages, 1866
53 - Alvinellidae Desbruyères and Laubier, 1986
54 - Ampharetidae Malmgren, 1866
55 - Trichobranchidae Malmgren, 1866
56 - Terebellidae Johnston, 1846
57 - Melinnidae Chamberlin, 1919
58 - Heterospio Ehlers, 1875
59 - Cirratulidae Ryckholdt, 1851
60 - Acrocirridae Banse, 1969
61 - Flabelligeridae Saint-Joseph, 1894
62 - Paraonidae Cerruti, 1909
63 - Sternaspidae Carus, 1863
64 - Fauveliopsidae Hartman, 1971
65 - Siboglinidae Caullery, 1914
66 - Orbiniidae Hartman, 1942
67 - Parergodrilidae Reisinger, 1925
68 - Cossura Webster and Benedict, 1887
69 - Diurodrilidae Kristensen and Niilonen, 1982
70 - Dinophilidae Macalister, 1876
71 - Lobatocerebrum Rieger, 1980
72 - Amphinomida Lamarck, 1818
73 - Sipuncula Stephen, 1964
74 - Apistobranchus Levinsen, 1883
75 - Psammodrilus Swedmark, 1952
76 - Chaetopteridae Audouin and Milne Edwards, 1833
77 - Oweniidae Rioja, 1917
78 - Magelonidae Cunningham and Ramage, 1888