1. Rachycentron Kaup 1826
2. Raillietina Fuhrman 1920
3. Rana Linnaeus 1758
4. Ranatra Fabricius 1790
5. Ranodon Kessler 1866
6. Ranunculus Linné
7. Raphanus Linné
8. Raphus Brisson 1760
9. Rastrelliger Jordan & Starks 1908
10. Rathkea Brandt 1837
11. Rattus Fischer de Waldheim 1803
12. Rauschiella Babero 1951
13. Redigobius Herre 1927
14. Regalecus Ascanius 1772
15. Regimbartia Zaitzev 1908
16. Reishia Kuroda & Habe 1971
17. Remora T.N. Gill 1862
18. Repomucenus Whitley 1931
19. Reticunassa Iredale 1936
20. Reynoutria Houttuyn 1777
21. Rhabdamia M.C.W. Weber 1909
22. Rhabdias Stiles & Hassall 1905
23. Rhabditis Dujardin 1844
24. Rhabdoblennius Whitley 1930
25. Rhabdochona Railliet 1916
26. Rhabdophis
27. Rhabdosargus Fowler 1933
28. Rhacophorus Kuhl & Hasselt 1822
29. Rhagadotarsus Breddin 1905
30. Rhantus Dejean 1833
31. Rhaphiolepis Lindley 1820
32. Rheocyclops Reid et al. 1999
33. Rhina Bloch & Schneider 1801
34. Rhincodon A. Smith 1829
35. Rhinobatos H.F. Linck 1790
36. Rhinogobius Gill 1859
37. Rhinolophus Lacépède 1799
38. Rhipidaster Sladen 1889
39. Rhizophora Linné
40. Rhizopsammia Verrill 1869
41. Rhizotrochus Milne-Edwards & Haime 1848
42. Rhodeus Agassiz 1832
43. Rhododendron Linné
44. Rhombomys Wagner 1841
45. Rhopilema Haeckel 1880
46. Rhoptromyrmex Mayr 1901
47. Rhus Linné
48. Rhyacotriton
49. Rhynchocypris Günther 1889
50. Rhynchonella Fischer 1809
51. Rhynchopelates Fowler 1931
52. Rhynchophorus Herbst 1795
53. Rhyothemis Hagen 1867
54. Rhyparobia Krauss 1892
55. Rhyssoplax Thiele 1893
56. Rhytirhynchia Cooper 1957
57. Riccia Linné 1753
58. Rickettsia da Rocha-Lima 1916
59. Rictularia Frölich 1802
60. Roa Jordan 1923
61. Robinia
62. Robinsia J.E. Böhlke & D.G. Smith 1967
63. Rodentolepis Spasskii 1954
64. Rogadius D.S. Jordan & R.E. Richardson 1908
65. Rosa Linné
66. Rosalia Audinet-Serville 1833
67. Rotaria Scopoli 1777
68. Rubus
69. Rudarius D.S. Jordan & Fowler 1902
70. Ruditapes Chiamenti 1900
71. Rugulopteryx De Clerck & Coppejans 2006
72. Rupa Jedlicka 1935
73. Ryukyua Williams & Bunkley-Williams 1994
74. Ryukyupercis Imamura & Yoshino 2007