1. Sabellariidae Johnston 1865
2. Sabellidae Latreille 1825
3. Saccamminidae Brady 1884
4. Sagittidae Claus & Grobben 1905
5. Sagittiferidae Kostenko & Mamkaev 1990
6. Salamandridae Goldfuss 1820
7. Salangidae Bleeker 1859
8. Salicaceae de Mirbel 1815
9. Salmonidae G. Cuvier 1816
10. Samaridae Jordan & Goss 1889
11. Sapindaceae de Jussieu 1789
12. Sapotaceae de Jussieu 1789
13. Sargassaceae Kützing 1843
14. Saturniidae
15. Scalibregmatidae Malmgren 1867
16. Scaliolidae Jousseaume 1912
17. Scalpellidae Pilsbry 1907
18. Scarabaeidae Latreille 1802
19. Scaridae Rafinesque 1810
20. Scatophagidae Bleeker 1876
21. Schisandraceae Blume 1830
22. Schistosomatidae Poche 1907
23. Schizasteridae Lambert 1905
24. Sciaenidae Cuvier 1829
25. Scincidae Gray 1825
26. Sciuridae Fischer de Waldheim 1817
27. Scolopacidae Rafinesque 1815
28. Scomberesocidae J.P. Müller 1843
29. Scombridae Rafinesque 1815
30. Scombropidae Gill 1862
31. Scorpaenidae A. Risso 1826
32. Scrophulariaceae de Jussieu 1789
33. Scutellidae Gray 1825
34. Scyliorhinidae T.N. Gill 1862
35. Scyllaridae Latreille 1825
36. Scytosiphonaceae Farlow 1881
37. Sebastidae Kaup 1873
38. Semelidae Stoliczka 1870
39. Semisulcospiridae Morrison 1952
40. Sergestidae Dana 1852
41. Serpulidae Rafinesque 1815
42. Serranidae Innamura & Yabe 2002
43. Sertulariidae Lamouroux 1812
44. Sesarmidae Dana 1851
45. Setarchidae Ishida 1994
46. Setaridae
47. Seuratidae Railliet 1906
48. Sigalionidae Malmgren 1867
49. Siganidae Richardson 1837
50. Sillaginidae Richardson 1846
51. Silphidae Latreille 1807
52. Siluridae G. Cuvier 1816
53. Siphonariidae Gray 1827
54. Sirenidae Gray 1825
55. Siricidae
56. Skeletonemaceae Lebour 1930
57. Skrjabingylidae Skrjabin 1933
58. Soboliphymatidae Railliet 1915
59. Solasteridae Viguier 1878
60. Soleidae Bonaparte 1832
61. Solemyidae Gray 1840
62. Solenidae Lamarck 1809
63. Solenoceridae Wood-Mason in Wood-Mason & Alcock 1891
64. Soricidae G. Fischer 1814
65. Sparidae Rafinesque 1810
66. Sphaeriidae Deshayes 1855 (1820)
67. Sphaeromatidae Latreille 1825
68. Sphagnaceae Dumort.
69. Sphecidae Latreille 1802
70. Sphingidae
71. Sphyraenidae Rafinesque 1815
72. Sphyrnidae T.N. Gill 1872
73. Spintheridae Augener 1913
74. Spionidae Grube 1850
75. Spirocercidae Chitwood & Wehr 1932
76. Spirochaetaceae Swellengrebel 1907
77. Spiruridae Örley 1885
78. Spongiphoridae Verhoeff 1902
79. Squalidae de Blainville 1816
80. Squatinidae Bonaparte 1838
81. Stachyuraceae J.Agardh
82. Staphyleaceae (de Candolle) Lindley
83. Staphylinidae Lameere 1900
84. Stegostomatidae T.N. Gill 1862
85. Stenopsychidae Martynov 1924
86. Stenothyridae Tryon 1866
87. Sternaspidae Carus 1863
88. Sternoptychidae T.N. Gill 1863
89. Stichaeidae Gill 1864
90. Stichopodidae Haeckel 1896
91. Stomiidae Bleeker 1859
92. Streptaxidae Gray 1860
93. Strigeidae Railliet 1919
94. Strigidae Vigors 1825
95. Strombidae Rafinesque 1815
96. Strongylidae Baird 1853
97. Strongylocentrotidae Gregory 1900
98. Strongyloididae Chitwood & McIntosh 1934
99. Sturnidae Rafinesque 1815
100. Styelidae Sluiter 1895
101. Stylasteridae Gray 1847
102. Stylochidae Stimpson 1857
103. Styracaceae Dumortier
104. Suberitidae Schmidt 1870
105. Subulinidae P. Fischer & Crosse 1877
106. Subuluridae Travassos 1914
107. Succineidae Beck 1837
108. Suidae Gray 1821
109. Sycettidae Dendy 1893
110. Syllidae Grube 1850
111. Symplocaceae Desfontaines 1820
112. Synallactidae Ludwig 1894
113. Synanceiidae Kaup 1873
114. Synbranchidae
115. Synchaetidae Hudson & Gosse 1886
116. Syngamidae Leiper 1912
117. Syngnathidae Rafinesque 1810
118. Synodontidae T.N. Gill 1862
119. Syrphidae Latreille 1802