1. Gadus Linnaeus 1758
2. Gaetice Gistel 1835
3. Galathea Fabricius 1793
4. Galaxea Oken 1815
5. Galeocerdo Mueller & Henle 1837
6. Galerita Fabricius 1801
7. Galeus Rafinesque 1810
8. Galkinia Ross & Newman 1995
9. Gallinago Brisson 1760
10. Gallobelgicus Distant 1906
11. Gallus Brisson 1760
12. Gambusia Poey 1854
13. Gammarus Fabricius 1775
14. Ganguleterakis Lane 1914
15. Gardineroseris Scheer & Pillai 1974
16. Gari Schumacher 1817
17. Garrulax Lesson 1831
18. Gasterosteus Linnaeus 1758
19. Gastrancistrus Westwood 1833
20. Gastrocopta Wollaston 1878
21. Gauromyrmex Menozzi 1933
22. Gavia Forster 1788
23. Gelidium J.V. Lamouroux 1813
24. Geoclemys Gray 1870
25. Geopetitia Chabaud 1951
26. Georissa Blanford 1884
27. Geothelphusa Stimpson 1858
28. Gephyroberyx Boulenger 1902
29. Gerres Quoy & Gaimard 1824
30. Gerris Fabricius 1794
31. Gigantapseudes Kudinova-Pasternak 1978
32. Ginglymostoma Müller & Henle 1837
33. Girella Gray 1835
34. Glaciarcula Elliott 1956
35. Glaphyrammina Loeblich & Tappan 1984
36. Glauconome Gray 1828
37. Globicephala Lesson 1828
38. Globocephalus Molin 1861
39. Gloiopeltis J. Agardh 1842
40. Gloiopotes Steenstrup & Lütken 1861
41. Glossaulax Pilsbry 1929
42. Glossiphonia Johnston 1816
43. Glossobius Schiödte & Meinert 1883
44. Glossogobius Gill 1859
45. Glottidia Dall 1870
46. Gloydius Hoge & Romano-Hoge 1981
47. Glugea Thélohan 1891
48. Glycera Savigny 1818
49. Glycine
50. Glycymeris da Costa 1778
51. Glyphocrangon A. Milne-Edwards 1881
52. Glypthelmins Stafford 1905
53. Glyptocephalus Gottsche 1835
54. Gnathophis Kaup 1860
55. Gnathopogon Bleeker 1860
56. Gnathostoma Owen 1836
57. Gnorimosphaeroma Menzies 1954
58. Gobiopsis Steindachner 1860
59. Gobius Linnaeus 1758
60. Gomphina Mörch 1853
61. Gongylonema Molin 1857
62. Goniastrea Milne-Edwards & Haime 1848
63. Goniistius Gill 1862
64. Gonimbrasia Butler 1878
65. Goniocorella Yabe & Eguchi 1932
66. Gonioplectrus Gill 1862
67. Goniopora de Blainville 1830
68. Gonocephalum Solier 1834
69. Gonorynchus Scopoli 1777
70. Gordius Linnaeus 1758
71. Gorilla I. Geoffroy 1852
72. Gorsakius Bonaparte 1855
73. Gracila Randall 1964
74. Gracilaria Greville 1830
75. Grallenia Shibukawa & Iwata 2007
76. Grammetaria Cooper 1959
77. Grammomys Thomas 1915
78. Grandidierella Coutière 1904
79. Grapsus Lamarck 1801
80. Grateloupia C. Agardh 1822
81. Grouvellinus Champion 1923
82. Gryphus Megerle von Mühlfeld 1811
83. Guernea Chevreux 1887
84. Guignotus Houlbert 1934
85. Guildfordia Gray 1850
86. Guitarra Carter 1874
87. Gulcamptus Miura 1969
88. Gwynia King 1859
89. Gyalocephalus Looss 1900
90. Gymnanthenea H.L. Clark 1938
91. Gymnocaesio Bleeker 1875
92. Gymnocranius Klunzinger 1870
93. Gymnogobius Gill 1863
94. Gymnophallus Odhner 1900
95. Gymnosarda Gill 1862
96. Gymnoscyphus J.E. Böhlke & C.R. Robins 1970
97. Gymnothorax Bloch 1795
98. Gymnura van Hasselt 1823
99. Gynacantha Rambur 1842
100. Gyraulus Charpentier 1837
101. Gyrodactylus Nordmann 1832
102. Gyrothyris Thomson 1918