1. Species Idotea aleutica Gurjanova, 1933
2. Species Idotea balthica (Pallas, 1772)
3. Species Idotea brevicauda Dana, 1853
4. Species Idotea brevicorna Milne Edwards, 1840
5. Species Idotea chelipes (Pallas, 1766)
6. Species Idotea danai Miers, 1881
7. Species Idotea delfini Porter, 1903
8. Species Idotea emarginata (Fabricius, 1793)
9. Species Idotea fewkesi Richardson, 1905
10. Species Idotea granulosa Rathke, 1843
11. Species Idotea gurjanovae Kussakin, 1974
12. Species Idotea indica Milne Edwards, 1840
13. Species Idotea linearis (Linnaeus, 1767)
14. Species Idotea metallica Bosc, 1801
15. Species Idotea neglecta G. O. Sars, 1897
16. Species Idotea obscura Rafi, 1972
17. Species Idotea ochotensis Brandt, 1851
18. Species Idotea orientalis Gurjanova, 1933
19. Species Idotea ostroumovi Sowinsky, 1895
20. Species Idotea pelagica Leach, 1816
21. Species Idotea phosphorea Harger, 1873 in Verrill, Smith & Harger, 1873
22. Species Idotea rufescens Fee, 1927
23. Species Idotea spasskii Gurjanova, 1950
24. Species Idotea urotoma Stimpson, 1864
25. Species Idotea whymperi Miers, 1881
26. Species Idotea ziczac Barnard, 1951
27. Subgenus Idotea (Pentidotea) Richardson, 1905 accepted as Pentidotea Richardson, 1905 (elevated to genus)
    1. Species Idotea (Pentidotea) kirchanskii Miller & Lee, 1970 accepted as Pentidotea kirchanskii (Miller & Lee, 1970) (superseded original combination)
    2. Species Idotea (Pentidotea) panousei Daguerre de Hureaux, 1968 accepted as Pentidotea panousei (Daguerre de Hureaux, 1968) (superseded original combination)
    3. Species Idotea (Pentidotea) recta Rafi & Laubitz, 1990 accepted as Pentidotea recta (Rafi & Laubitz, 1990) (superseded original combination)
28. Subgenus Idotea (Stenosoma) Leach, 1814 accepted as Stenosoma Leach, 1814 (accepted at genus rank)
    1. Species Idotea (Stenosoma) pusilla Eichwald, 1842 accepted as Idotea balthica (Pallas, 1772) (superseded original combination)
29. Species Idotea aculeata (Stafford, 1913) accepted as Pentidotea aculeata Stafford, 1913 (superseded combination)
30. Species Idotea acuminata (Leach, 1814) accepted as Stenosoma acuminatum Leach, 1814 (unaccepted > superseded combination)
31. Species Idotea acuminatum (Leach, 1814) accepted as Stenosoma acuminatum Leach, 1814 (unaccepted > superseded combination)
32. Species Idotea affinis Milne Edwards, 1840 accepted as Paridotea ungulata (Pallas, 1772) (junior subjective synonym)
33. Species Idotea albicornis (Fabricius, 1793) accepted as Cymothoa albicornis Fabricius, 1793 accepted as Anilocra physodes (Linnaeus, 1758) (unaccepted > superseded combination)
34. Species Idotea algirica Lucas, 1846 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
35. Species Idotea angusta G. O. Sars, 1897 accepted as Idotea chelipes (Pallas, 1766) (junior subjective synonym)
36. Species Idotea angustata Lucas, 1846 accepted as Stenosoma capito (Rathke, 1836) (junior subjective synonym)
37. Species Idotea angustata Nicolet, 1849 accepted as Cleantis gayi Miers, 1881 (junior homonym)
38. Species Idotea annulata Dana, 1849 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
39. Species Idotea argentea Dana, 1849 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
40. Species Idotea atrata A. Costa, 1840 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
41. Species Idotea baltica Pallas, 1772 accepted as Idotea balthica (Pallas, 1772) (unaccepted > misspelling - incorrect subsequent spelling)
42. Species Idotea basteri Audouin, 1826 accepted as Idotea balthica (Pallas, 1772) (unaccepted > junior subjective synonym)
43. Species Idotea bicuspida Owen, 1839 accepted as Synidotea bicuspida (Owen, 1839) (superseded original combination)
44. Species Idotea bocqueti Rezig, 1977 accepted as Idotea chelipes bocqueti Rezig, 1977 (superseded original combination)
45. Species Idotea brevicornis Rathke, 1843 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
46. Species Idotea carinata Lucas, 1846 accepted as Stenosoma carinata (Lucas, 1846) (superseded original combination)
47. Species Idotea caudacuta Haswell, 1881 accepted as Euidotea peronii (Milne Edwards, 1840) (unaccepted > junior subjective synonym)
48. Species Idotea coeca Say, 1818 accepted as Chiridotea coeca (Say, 1818) (unaccepted > superseded combination)
49. Species Idotea consolidata Stimpson, 1856 accepted as Synidotea consolidata (Stimpson, 1856) (superseded original combination)
50. Species Idotea cretaria Dahl, 1916 accepted as Idotea granulosa Rathke, 1843 (junior subjective synonym)
51. Species Idotea derjugini Gurjanova, 1933 accepted as Idotea ochotensis Brandt, 1851 (junior subjective synonym)
52. Species Idotea diodon Latreille, 1816 accepted as Idotea linearis (Linnaeus, 1767) (junior subjective synonym)
53. Species Idotea distincta Guérin-Méneville, 1843 accepted as Euidotea peronii (Milne Edwards, 1840) (junior subjective synonym)
54. Species Idotea duplicata Nierstrasz, 1941 accepted as Idotea brevicorna Milne Edwards, 1840 (junior subjective synonym)
55. Species Idotea edwardsii Guérin-Méneville, 1843 accepted as Paridotea ungulata (Pallas, 1772) (junior subjective synonym)
56. Species Idotea elongata Miers, 1876 accepted as Batedotea elongata (Miers, 1876) (superseded original combination)
57. Species Idotea entomon (Linnaeus, 1758) accepted as Saduria entomon (Linnaeus, 1758) (unaccepted > superseded combination)
58. Species Idotea excavata Haswell, 1881 accepted as Paridotea ungulata (Pallas, 1772) (unaccepted > junior subjective synonym)
59. Species Idotea excisa Bosc, 1801 accepted as Idotea emarginata (Fabricius, 1793) (unaccepted > junior subjective synonym)
60. Species Idotea festiva Chilton, 1885 accepted as Takereana festiva (Chilton, 1885) (superseded original combination)
61. Species Idotea guadeloupensis (Fabricius, 1793) accepted as Cymothoa guadeloupensis Fabricius, 1793 (unaccepted > superseded combination)
62. Species Idotea hectica Pallas, 1772 accepted as Synischia hectica (Pallas, 1772) (superseded original combination)
63. Species Idotea hirtipes Milne Edwards, 1840 accepted as Synidotea hirtipes (Milne Edwards, 1840) (superseded original combination)
64. Species Idotea hirtipes Dana, 1853 accepted as Pentidotea wosnesenskii (Brandt, 1851) (junior subjective synonym)
65. Species Idotea japonica Richardson, 1900 accepted as Idotea ochotensis Brandt, 1851 (unaccepted > junior subjective synonym)
66. Species Idotea lacustris Thomson, 1879 accepted as Austridotea lacustris (Thomson, 1879) (superseded original combination)
67. Species Idotea lalandii Milne Edwards, 1840 accepted as Paridotea ungulata (Pallas, 1772) (junior subjective synonym)
68. Species Idotea latreillei Guérin-Méneville, 1843 accepted as Idotea indica Milne Edwards, 1840 (junior subjective synonym)
69. Species Idotea lichtensteinii Krauss, 1843 accepted as Glyptidotea lichtensteinii (Krauss, 1843) (superseded original combination)
70. Species Idotea lobata Miers, 1881 accepted as Engidotea lobata (Miers, 1881) (superseded original combination)
71. Species Idotea margaritacea Dana, 1853 accepted as Idotea metallica Bosc, 1801 (junior synonym)
72. Species Idotea marina (Linnaeus, 1758) accepted as Idotea balthica (Pallas, 1772) (Oniscus marinus suppressed by ICZN (1963))
73. Species Idotea marmorata Packard, 1867 accepted as Synidotea marmorata (Packard, 1867) (unaccepted > superseded combination)
74. Species Idotea media Dana, 1854 accepted as Pentidotea wosnesenskii (Brandt, 1851) (junior subjective synonym)
75. Species Idotea montereyensis (Maloney, 1933) accepted as Pentidotea montereyensis Maloney, 1933 (outdated combination)
76. Species Idotea montosa Stimpson, 1853 accepted as Edotia montosa (Stimpson, 1853) (superseded original combination)
77. Species Idotea muricata Harford, 1877 accepted as Synidotea muricata (Harford, 1877) (corrected spelling of genus name)
78. Species Idotea nitida Heller, 1861 accepted as Paridotea ungulata (Pallas, 1772) (junior subjective synonym)
79. Species Idotea nodulosa Krøyer, 1846 accepted as Synidotea nodulosa (Krøyer, 1846) (superseded original combination)
80. Species Idotea oestrum (Linnaeus, 1758) accepted as Cymothoa oestrum (Linnaeus, 1758) (unaccepted > superseded combination)
81. Species Idotea oregonensis Dana, 1854 accepted as Pentidotea wosnesenskii (Brandt, 1851) (junior subjective synonym)
82. Species Idotea parallela Bate & Westwood, 1868 accepted as Zenobia prismatica Risso, 1827 accepted as Cleantis prismatica (Risso, 1827)
83. Species Idotea peloponesiaca Roux, 1830 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
84. Species Idotea peronii Milne Edwards, 1840 accepted as Euidotea peronii (Milne Edwards, 1840) (superseded original combination)
85. Species Idotea physodes (Linnaeus, 1758) accepted as Anilocra physodes (Linnaeus, 1758) (unaccepted > superseded combination)
86. Species Idotea pontica Borcea, 1934 accepted as Synisoma capito (Rathke, 1836) accepted as Stenosoma capito (Rathke, 1836) (junior subjective synonym)
87. Species Idotea psora (Linnaeus, 1758) accepted as Aega psora (Linnaeus, 1758) (unaccepted > superseded combination)
88. Species Idotea pulchra Lockington, 1877 accepted as Synidotea bicuspida (Owen, 1839) (unaccepted > junior subjective synonym)
89. Species Idotea rectilinea Lockington, 1877 accepted as Idotea urotoma Stimpson, 1864 (junior subjective synonym)
90. Species Idotea rectilineata Richardson, 1899 accepted as Idotea urotoma Stimpson, 1864 (mispelling of Idotea rectilinea Lockington, 1877)
91. Species Idotea resecata Stimpson, 1857 accepted as Pentidotea resecata (Stimpson, 1857) (superseded original combination)
92. Species Idotea robusta Krøyer, 1846 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
93. Species Idotea rostrata Benedict, 1898 accepted as Colidotea rostrata (Benedict, 1898) (superseded original combination)
94. Species Idotea rotundata (Richardson, 1909) accepted as Pentidotea rotundata Richardson, 1909 (unaccepted > superseded combination)
95. Species Idotea rotundicauda Miers, 1881 accepted as Austridotea rotundicauda (Miers, 1881) (unaccepted > superseded combination, superseded original combination)
96. Species Idotea rugosa Milne Edwards, 1840 accepted as Idotea metallica Bosc, 1801 (junior subjective synonym)
97. Species Idotea rugulosa Buchholz, 1874 accepted as Synidotea bicuspida (Owen, 1839) (junior subjective synonym)
98. Species Idotea sabini Krøyer, 1849 accepted as Saduria sabini (Krøyer, 1849) (superseded original combination)
99. Species Idotea salinarium Dollfus, 1895 accepted as Idotea chelipes (Pallas, 1766) (junior subjective synonym)
100. Species Idotea sarsi Collinge, 1917 accepted as Idotea balthica (Pallas, 1772) (unaccepted > junior subjective synonym)
101. Species Idotea sexlineata Krøyer, 1846 accepted as Idotea linearis (Linnaeus, 1767) (junior subjective synonym)
102. Species Idotea slabberi Ritzema Bos, 1874 accepted as Idotea pelagica Leach, 1816 (unaccepted > junior subjective synonym)
103. Species Idotea stenops Benedict, 1898 accepted as Pentidotea stenops (Benedict, 1898) (superseded original combination)
104. Species Idotea stephenseni Collinge, 1916 accepted as Idotea ostroumovi Sowinsky, 1895 (unaccepted > junior subjective synonym)
105. Species Idotea stewarti Filhol, 1885 accepted as Holognathus stewarti (Filhol, 1885) (unaccepted > superseded combination)
106. Species Idotea stricta Dana, 1853 accepted as Euidotea stricta (Dana, 1853) (superseded original combination)
107. Species Idotea taurica Borcea, 1931 accepted as Idotea ostroumovi Sowinsky, 1895 (junior subjective synonym)
108. Species Idotea tricuspidata Desmarest, 1823 accepted as Idotea balthica (Pallas, 1772) (junior subjective synonym)
109. Species Idotea tridentata Latreille, 1806 accepted as Idotea balthica (Pallas, 1772) (junior subjective synonym)
110. Species Idotea triloba Say, 1818 accepted as Edotia triloba (Say, 1818) (unaccepted > superseded combination)
111. Species Idotea tuftsii Stimpson, 1853 accepted as Chiridotea tuftsii (Stimpson, 1853) (superseded original combination)
112. Species Idotea variegata Roux, 1830 accepted as Idotea balthica (Pallas, 1772) (junior subjective synonym)
113. Species Idotea viridis (Slabber, 1778) accepted as Idotea chelipes (Pallas, 1766) (unaccepted > junior subjective synonym)
114. Species Idotea viridissima Risso, 1816 accepted as Synischia hectica (Pallas, 1772) (junior subjective synonym)
115. Species Idotea wosnesenskii Brandt, 1851 accepted as Pentidotea wosnesenskii (Brandt, 1851) (superseded original combination)
116. Species Idotea americana (Fabricius, 1793) (uncertain > taxon inquirendum)
117. Species Idotea vittata Bosc, 1801 (uncertain > taxon inquirendum)
118. Species Idotea whitei Stimpson, 1864 (uncertain > nomen dubium)

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