1. Species Onchidium melakense Dayrat & Goulding, 2019
2. Species Onchidium multiradiatum C. Semper, 1882
3. Species Onchidium nebulosum C. Semper, 1880
4. Species Onchidium reevesii (Gray, 1850)
5. Species Onchidium stuxbergi (Westerlund, 1883)
6. Species Onchidium typhae Buchannan, 1800
7. Subgenus Onchidium (Arctonchis) Dall, 1905 accepted as Onchidella J. E. Gray, 1850
8. Subgenus Onchidium (Onchidella) J. E. Gray, 1850 accepted as Onchidella J. E. Gray, 1850
   1. Species Onchidium (Onchidella) floridanum Dall, 1885 accepted as Onchidella floridana (Dall, 1885) (unaccepted > superseded combination)
   2. Species Onchidium (Onchidella) transatlanticum Heilprin, 1889 accepted as Onchidella floridana (Dall, 1885) (unaccepted > junior subjective synonym)
9. Species Onchidium ambiguum C. Semper, 1880 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
10. Species Onchidium applanatum Simroth, 1920 accepted as Platevindex applanatus (Simroth, 1920) (original combination)
11. Species Onchidium astridae (Labbé, 1934) accepted as Peronia verruculata (Cuvier, 1830) (junior synonym)
12. Species Onchidium ater Lesson, 1831 accepted as Wallaconchis ater (Lesson, 1831) (original combination)
13. Species Onchidium burnupi Collinge, 1902 accepted as Platevindex burnupi (Collinge, 1902) (unaccepted > superseded combination)
14. Species Onchidium carpenteri W. G. Binney, 1860 accepted as Onchidella carpenteri (W. G. Binney, 1860) (original combination)
15. Species Onchidium celticum Audouin & H. Milne Edwards, 1832 accepted as Onchidella celtica (Audouin & H. Milne Edwards, 1832) (unaccepted > superseded combination)
16. Species Onchidium chilense Hupé, 1854 accepted as Onchidella marginata (Couthouy, 1852)
17. Species Onchidium coriaceum C. Semper, 1880 accepted as Platevindex coriaceus (C. Semper, 1880) (original combination)
18. Species Onchidium cubense L. Pfeiffer, 1840 accepted as Veronicella cubensis (L. Pfeiffer, 1840)
19. Species Onchidium daemelii C. Semper, 1880 accepted as Paromoionchis daemelii (C. Semper, 1880) (original combination)
20. Species Onchidium dämelii C. Semper, 1880 accepted as Onchidium daemelii C. Semper, 1880 accepted as Paromoionchis daemelii (C. Semper, 1880) (unauthorized use of a diacritic)
21. Species Onchidium durum Labbé, 1934 accepted as Peronia verruculata (Cuvier, 1830) (junior synonym)
22. Species Onchidium ferrugineum Lesson, 1831 accepted as Peronia verruculata (Cuvier, 1830) (junior synonym)
23. Species Onchidium floridanum Dall, 1885 accepted as Onchidella floridana (Dall, 1885) (unaccepted > superseded combination)
24. Species Onchidium fungiforme (Stantschinsky, 1907) accepted as Wallaconchis fungiformis (Stantschinsky, 1907)
25. Species Onchidium glabrum C. Semper, 1880 accepted as Semperoncis glaber (C. Semper, 1880)
26. Species Onchidium graniferum C. Semper, 1880 accepted as Wallaconchis graniferum (C. Semper, 1880) accepted as Wallaconchis graniferus (C. Semper, 1880) (original combination)
27. Species Onchidium hongkongense Britton, 1984 accepted as Paromoionchis tumidus (C. Semper, 1880)
28. Species Onchidium incisum Quoy & Gaimard, 1832 accepted as Onchidella incisa (Quoy & Gaimard, 1832)
29. Species Onchidium laevigatum Cuvier, 1816 accepted as Vaginulus laevigatus A. Férussac, 1822 (unaccepted > superseded combination)
30. Species Onchidium lanuginosum Hupé, 1854 accepted as Onchidella marginata (Couthouy, 1852) (unaccepted > junior subjective synonym)
31. Species Onchidium leopoldi Labbé, 1934 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
32. Species Onchidium lesliei Stearns, 1892 accepted as Onchidella lesliei (Stearns, 1892) (unaccepted > superseded combination, unaccepted combination)
33. Species Onchidium luteum C. Semper, 1882 accepted as Platevindex luteus (C. Semper, 1882) (original combination)
34. Species Onchidium marmoratum Lesson, 1831 accepted as Marmaronchis marmoratus (Lesson, 1831) (original combination)
35. Species Onchidium melanopneumon Bergh, 1884 accepted as Peronia peronii (Cuvier, 1804)
36. Species Onchidium meriakrii Stantschinsky, 1907 accepted as Alionchis meriakrii (Stantschinsky, 1907) (original combination)
37. Species Onchidium mertoni Simroth, 1920 accepted as Paromoionchis tumidus (C. Semper, 1880) (junior synonym)
38. Species Onchidium nanum R. A. Philippi, 1844 accepted as Onchidella celtica (Audouin & H. Milne Edwards, 1832) (unaccepted > junior subjective synonym)
39. Species Onchidium nigricans Quoy & Gaimard, 1832 accepted as Onchidella nigricans (Quoy & Gaimard, 1832)
40. Species Onchidium nigrum Plate, 1893 accepted as Onchidium stuxbergi (Westerlund, 1883)
41. Species Onchidium oniscioides Blainville, 1816 accepted as Onchidella oniscioides (Blainville, 1816)
42. Species Onchidium ovale C. Semper, 1880 accepted as Wallaconchis ovalis (C. Semper, 1880) (original combination)
43. Species Onchidium pallidipes Tapparone Canefri, 1889 accepted as Onchidium stuxbergi (Westerlund, 1883)
44. Species Onchidium patelloide Quoy & Gaimard, 1832 accepted as Onchidella nigricans (Quoy & Gaimard, 1832)
45. Species Onchidium peroni Cuvier, 1804 accepted as Peronia peronii (Cuvier, 1804) (misspelling)
46. Species Onchidium peronii Cuvier, 1804 accepted as Peronia peronii (Cuvier, 1804)
47. Species Onchidium platei Hoffmann, 1928 accepted as Peronia platei (Hoffmann, 1928) (original combination)
48. Species Onchidium punctatum Quoy & Gaimard, 1832 accepted as Peronia peronii (Cuvier, 1804) (junior synonym)
49. Species Onchidium reticulatum C. Semper, 1880 accepted as Onchidella reticulata (C. Semper, 1880) accepted as Onchidella nigricans (Quoy & Gaimard, 1832)
50. Species Onchidium samarense C. Semper, 1882 accepted as Paromoionchis tumidus (C. Semper, 1880) (junior synonym)
51. Species Onchidium schrammi Bland & W. G. Binney, 1874 accepted as Onchidella incisa (Quoy & Gaimard, 1832) (unaccepted > junior subjective synonym)
52. Species Onchidium steenstrupii C. Semper, 1882 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
53. Species Onchidium steindachneri C. Semper, 1880 accepted as Onchidella steindachneri (C. Semper, 1880) (unaccepted > superseded combination)
54. Species Onchidium struma accepted as Onchidium reevesii (Gray, 1850) (nomen nudum)
55. Species Onchidium tenerum Stoliczka, 1869 accepted as Peronina tenera (Stoliczka, 1869) (original combination)
56. Species Onchidium tigrinum Stoliczka, 1869 accepted as Platevindex tigrinus (Stoliczka, 1869) (original combination)
57. Species Onchidium tonganum Quoy & Gaimard, 1832 accepted as Peronia peronii (Cuvier, 1804)
58. Species Onchidium transatlanticum Heilprin, 1889 accepted as Onchidella floridana (Dall, 1885) (unaccepted > junior subjective synonym)
59. Species Onchidium trans-atlanticum Heilprin, 1889 accepted as Onchidella floridana (Dall, 1885) (unaccepted > junior subjective synonym, unaccepted use of a hyphen)
60. Species Onchidium tuberculatum Taslé, 1870 accepted as Onchidella celtica (Audouin & H. Milne Edwards, 1832) (unaccepted > junior subjective synonym)
61. Species Onchidium tumidum C. Semper, 1880 accepted as Paromoionchis tumidus (C. Semper, 1880) (origional combination)
62. Species Onchidium vaigiense Quoy & Gaimard, 1825 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
63. Species Onchidium verruculatum Cuvier, 1830 accepted as Peronia verruculata (Cuvier, 1830)
64. Species Onchidium aberrans C. Semper, 1882 (uncertain > nomen dubium)
65. Species Onchidium cinereum Quoy & Gaimard, 1832 (uncertain > nomen dubium)
66. Species Onchidium granulosum Lesson, 1831 (uncertain > nomen dubium)
67. Species Onchidium griseofuscum (Tapparone Canefri, 1874) (uncertain > nomen dubium)
68. Species Onchidium griseum Plate, 1893 (uncertain > nomen dubium)
69. Species Onchidium hardwickii (Gray, 1850) (uncertain > nomen dubium)
70. Species Onchidium harmandianum Rochebrune, 1882 (uncertain > nomen dubium)
71. Species Onchidium lixii Labbé, 1934 (uncertain > nomen dubium)
72. Species Onchidium multinotatum Plate, 1893 (uncertain > nomen dubium)
73. Species Onchidium palaense C. Semper, 1880 (uncertain > nomen dubium)
74. Species Onchidium pallidum Stoliczka, 1869 (uncertain > nomen dubium)
75. Species Onchidium papuanum C. Semper, 1880 (uncertain > nomen dubium)
76. Species Onchidium planatum Quoy & Gaimard, 1825 (uncertain > nomen dubium)
77. Species Onchidium savignyi C. Semper, 1880 (uncertain)
78. Species Onchidium secatum Quoy & Gaimard, 1824 (uncertain > nomen dubium)
79. Species Onchidium straelenii Labbé, 1934 (uncertain > nomen dubium)
80. Species Onchidium trapezoideum C. Semper, 1882 (uncertain > nomen dubium)
81. Species Onchidium tricolor Simroth, 1918 (uncertain > taxon inquirendum)

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