1. Species Nais abissalis Semernoy, 1984
2. Species Nais africana Brinkhurst, 1966
3. Species Nais alpina Sperber, 1948
4. Species Nais andhrensis Naidu & Naidu, 1981
5. Species Nais andina Černosvitov, 1939
6. Species Nais badia Peng, Wang & Cui, 2014
7. Species Nais baicalensis Sokolskaya, 1962
8. Species Nais barbata Müller, 1774
9. Species Nais barua Righi & Hamoui, 2002
10. Species Nais behningi Michaelsen, 1923
11. Species Nais bicuspidalis Grimm & Fend, 1997
12. Species Nais borutzkii Sokolskaya, 1964
13. Species Nais bretscheri Michaelsen, 1899
14. Species Nais carolina Blanchard, 1849
15. Species Nais christinae Kasprzak, 1973
16. Species Nais communis Piguet, 1906
17. Species Nais elinguis Müller, 1774
18. Species Nais inflata Liang, 1963
19. Species Nais kisui Sato, Ohtaka & Timm, 2009
20. Species Nais longidentata Cui, He, Peng & Wang, 2015
21. Species Nais magnaseta Harman, 1973
22. Species Nais pardalis Piguet, 1906
23. Species Nais pleomorpha Semernoy, 2004
24. Species Nais pseudobtusa Piguet, 1906
25. Species Nais schubarti Marcus, 1944
26. Species Nais similis Semernoy, 1984
27. Species Nais simplex Piguet, 1906
28. Species Nais sokolskajae Semernoy, 2004
29. Species Nais stolci Hrabĕ, 1981
30. Species Nais tatijanae Semernoy, 1984
31. Species Nais tygrina Isossimov, 1962
32. Species Nais variabilis Piguet, 1906
33. Species Nais appendiculata d'Udekem, 1855 accepted as Slavina appendiculata (d'Udekem, 1855) (Synonym)
34. Species Nais aralensis Lastockin in Beklemichev, 1922 accepted as Nais elinguis Müller, 1774
35. Species Nais aurigena Eichwald, 1847 accepted as Aeolosoma aurigena (Eichwald, 1847)
36. Species Nais bauchiensis Stephenson, 1930 accepted as Allodero bauchiensis (Stephenson, 1930)
37. Species Nais bekmanae [auct. misspelling of bekmani] accepted as Nais bekmani Sokolskaya, 1962 (unaccepted > misspelling - incorrect subsequent spelling, subsequent misspelling of bekmani)
38. Species Nais bihorensis Pop, 1971 accepted as Specaria josinae (Vejdovský, 1884)
39. Species Nais blanci Piguet, 1906 accepted as Piguetiella blanci (Piguet, 1906)
40. Species Nais denticulata Chen, 1940 accepted as Allonais pectinata (Stephenson, 1910)
41. Species Nais diaphana Gruithuisen, 1828 accepted as Chaetogaster diaphanus (Gruithuisen, 1828) (Synonym)
42. Species Nais diastropha Gruithuisen, 1828 accepted as Chaetogaster diastrophus (Gruithuisen, 1828) (Synonymy)
43. Species Nais diastrophus Gruithuisen, 1828 accepted as Chaetogaster diastrophus (Gruithuisen, 1828)
44. Species Nais digitata Müller, 1774 accepted as Dero digitata (Müller, 1774)
45. Species Nais escherosa Gruithuisen, 1828 accepted as Slavina appendiculata (d'Udekem, 1855)
46. Species Nais filiformis Blainville, 1825 accepted as Tubifex tubifex tubifex (Müller, 1774) (unaccepted > junior subjective synonym)
47. Species Nais filiformis [auct. mistaken attribution to Williams, 1852] accepted as Tubifex tubifex (Müller, 1774) (unaccepted > misapplication, misapplied attribution of N. filiformis Blainville 1825 to Williams, 1852)
48. Species Nais florifera Oken, 1815 accepted as Dero digitata (Müller, 1774)
49. Species Nais furcata Müller, 1774 accepted as Aulophorus furcatus (Müller, 1774)
50. Species Nais furcata Oken, 1815 accepted as Aulophorus furcatus (Müller, 1774)
51. Species Nais fusca Carter, 1858 accepted as Allonais gwaliorensis (Stephenson, 1920)
52. Species Nais gracilis Leidy, 1850 accepted as Slavina appendiculata (d'Udekem, 1855)
53. Species Nais gwaliorensis Stephenson, 1920 accepted as Allonais gwaliorensis (Stephenson, 1920)
54. Species Nais hamata Timm, 1883 accepted as Vejdovskyella (Vejdovskyella) comata (Vejdovský, 1884)
55. Species Nais heterochaeta Benham, 1893 accepted as Nais communis Piguet, 1906
56. Species Nais iorensis Pataridze, 1957 accepted as Nais bretscheri Michaelsen, 1899
57. Species Nais josinae Vejdovský, 1884 accepted as Specaria josinae (Vejdovský, 1884)
58. Species Nais koshovi Sokolskaya, 1962 accepted as Vejdovskyella (Machetna) koshovi (Sokolskaya, 1962)
59. Species Nais lacustris Dalyell, 1853 accepted as Chaetogaster diaphanus (Gruithuisen, 1828)
60. Species Nais lacustris (Linnaeus, 1758) accepted as Stylaria lacustris (Linnaeus, 1758)
61. Species Nais lastockini Sokolskaya, 1958 accepted as Nais pardalis Piguet, 1906
62. Species Nais laticeps (Dugès, 1830) accepted as Chaetogaster laticeps (Dugès, 1830) accepted as Aeolosoma laticeps (Dugès, 1830) (unaccepted > superseded combination)
63. Species Nais litoralis Müller, 1784 accepted as Paranais litoralis (Müller, 1784) (superseded original combination)
64. Species Nais littoralis [auct. misspelling for litoralis] accepted as Paranais litoralis (Müller, 1784) (subsequent misspelling by Blainville, Örsted and others of Nais litoralis Müller, 1784)
65. Species Nais longiseta (Ehrenberg, 1828) accepted as Pristina longiseta Ehrenberg, 1831 represented as Pristina (Pristina) longiseta Ehrenberg, 1831
66. Species Nais lurco Johnston, 1846 accepted as Chaetogaster diaphanus (Gruithuisen, 1828)
67. Species Nais lurida Timm, 1883 accepted as Slavina appendiculata (d'Udekem, 1855)
68. Species Nais malayana Stephenson, 1931 accepted as Allodero malayana (Stephenson, 1931)
69. Species Nais menoni Naidu, 1962 accepted as Nais andhrensis Naidu & Naidu, 1981 (nom.nov. pro)
70. Species Nais obtusa (Gervais, 1838) accepted as Nais barbata Müller, 1774
71. Species Nais papillosa Kessler, 1868 accepted as Spirosperma ferox Eisen, 1879
72. Species Nais paraguayensis Michaelsen, 1905 accepted as Allonais paraguayensis (Michaelsen, 1905)
73. Species Nais parasita (Schmidt, 1847) accepted as Ripistes parasita (Schmidt, 1847)
74. Species Nais parviseta Walton, 1906 accepted as Nais communis Piguet, 1906
75. Species Nais pectinata Stephenson, 1910 accepted as Allonais pectinata (Stephenson, 1910)
76. Species Nais perversa Gruithuisen, 1828 accepted as Nais diastropha Gruithuisen, 1828 accepted as Chaetogaster diastrophus (Gruithuisen, 1828)
77. Species Nais proboscidea Müller, 1774 accepted as Stylaria lacustris (Linnaeus, 1758)
78. Species Nais pseudoobtusa Piguet, 1906 accepted as Nais pseudobtusa Piguet, 1906 (Spelling variation)
79. Species Nais pseudoptusa Piguet, 1906 accepted as Nais pseudobtusa Piguet, 1906 (Spelling variation)
80. Species Nais pusulosa Williams, 1858 (unaccepted > nomen nudum, ? Tubificoides benedii)
81. Species Nais quadricuspidata Fabricius, 1780 accepted as Nais quadricuspida Fabricius, 1780 accepted as Naineris quadricuspida (Fabricius, 1780) (wrong spelling)
82. Species Nais raviensis Stephenson, 1914 accepted as Dero raviensis (Stephenson, 1914)
83. Species Nais reckei (Floericke, 1892) accepted as Ophidonais serpentina (Müller, 1774)
84. Species Nais sanguinea Doyère, 1856 accepted as Tubifex tubifex tubifex (Müller, 1774) (unaccepted > junior subjective synonym)
85. Species Nais scotia Johnston, 1865 accepted as Chaetogaster diaphanus (Gruithuisen, 1828)
86. Species Nais scotica Johnston, 1865 accepted as Chaetogaster diaphanus (Gruithuisen, 1828)
87. Species Nais serpentina Müller, 1774 accepted as Ophidonais serpentina (Müller, 1774)
88. Species Nais tenuidentis Walton, 1906 accepted as Dero raviensis (Stephenson, 1914)
89. Species Nais tubifex (Müller, 1774) accepted as Tubifex tubifex (Müller, 1774) (Synonym)
90. Species Nais uncinata Ørsted, 1842 accepted as Uncinais uncinata (Ørsted, 1842) (Synonym)
91. Species Nais variegata Schweigger, 1820 accepted as Lumbriculus variegatus (Müller, 1774)
92. Species Nais vasculosa [Renier], [1804] (unaccepted > unavailable name)
93. Species Nais vermicularis O. F. Müller, 1774 accepted as Chaetogaster vermicularis (Müller, 1774) (superseded original combination (and see synonymy note))
94. Species Nais albida Carter, 1858 (uncertain > nomen dubium, probably Enchytraeidae)
95. Species Nais auricularia Bosc, 1802 (uncertain > nomen dubium, Probably polychaeta or Echinodermata tentacle?)
96. Species Nais bekmani Sokolskaya, 1962 (uncertain > taxon inquirendum, possibly Nais variabilis)
97. Species Nais brumati Nardo, 1847 (uncertain > taxon inquirendum)
98. Species Nais caeca Müller, 1776 (uncertain > taxon inquirendum, unsufficient description)
99. Species Nais caecilia Mayer, 1859 (uncertain > nomen dubium)
100. Species Nais caudata Schmarda, 1861 (uncertain > taxon inquirendum)
101. Species Nais decapoda (Dutrochet, 1819) (uncertain > taxon inquirendum)
102. Species Nais equisetina Dugès, 1837 (uncertain > taxon inquirendum, Probably Polychaeta: Fabriciidae ?)
103. Species Nais gigantea Kessler, 1868 (uncertain > nomen dubium)
104. Species Nais greeffi Floericke, 1892 (uncertain > taxon inquirendum, possibly Nais barbata)
105. Species Nais incerta Černosvitov, 1942 (uncertain > taxon inquirendum, Replacement name for Pristina variabilis Friend 1916)
106. Species Nais japonica Kondo, 1936 (uncertain > taxon inquirendum, Aulophorus?)
107. Species Nais marina Fabricius, 1780 (uncertain > nomen dubium, possibly Polychaeta)
108. Species Nais parvula Walton, 1906 (uncertain > taxon inquirendum, possibly Nais communis)
109. Species Nais rigidula Nardo, 1847 (uncertain > taxon inquirendum)
110. Species Nais rivulosa Leidy, 1850 (uncertain > taxon inquirendum, possibly Nais variabilis)
111. Species Nais ternaria Schmarda, 1861 (uncertain > taxon inquirendum)
112. Species Nais tortuosa Walton, 1906 (uncertain > taxon inquirendum, Possibly Nais simplex/pseudobtusa/alpina)

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