• Onchidium Buchannan, 1800
• Onchidium (Arctonchis) Dall, 1905 accepted as Onchidella J. E. Gray, 1850
• Onchidium (Onchidella) J. E. Gray, 1850 accepted as Onchidella J. E. Gray, 1850
• Onchidium (Onchidella) floridanum Dall, 1885 accepted as Onchidella floridana (Dall, 1885)
• Onchidium (Onchidella) transatlanticum Heilprin, 1889 accepted as Onchidella floridana (Dall, 1885)
• Onchidium aberrans C. Semper, 1882 (uncertain > nomen dubium)
• Onchidium ambiguum C. Semper, 1880 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
• Onchidium applanatum Simroth, 1920 accepted as Platevindex applanatus (Simroth, 1920)
• Onchidium astridae (Labbé, 1934) accepted as Peronia verruculata (Cuvier, 1830)
• Onchidium ater R. P. Lesson, 1831 accepted as Wallaconchis ater (R. P. Lesson, 1831)
• Onchidium burnupi Collinge, 1902 accepted as Platevindex burnupi (Collinge, 1902)
• Onchidium carpenteri W. G. Binney, 1860 accepted as Onchidella carpenteri (W. G. Binney, 1860)
• Onchidium celticum Audouin & H. Milne Edwards, 1832 accepted as Onchidella celtica (Audouin & H. Milne Edwards, 1832)
• Onchidium chameleon Brazier, 1886 accepted as Onchidina australis (C. Semper, 1880)
• Onchidium chilense Hupé, 1854 accepted as Onchidella marginata (Couthouy, 1852)
• Onchidium cinereum Quoy & Gaimard, 1832 (uncertain > nomen dubium)
• Onchidium coriaceum C. Semper, 1880 accepted as Platevindex coriaceus (C. Semper, 1880)
• Onchidium cubense L. Pfeiffer, 1840 accepted as Veronicella cubensis (L. Pfeiffer, 1840)
• Onchidium daemelii C. Semper, 1880 accepted as Paromoionchis daemelii (C. Semper, 1880)
• Onchidium dämelii C. Semper, 1880 accepted as Onchidium daemelii C. Semper, 1880 accepted as Paromoionchis daemelii (C. Semper, 1880)
• Onchidium durum Labbé, 1934 accepted as Peronia verruculata (Cuvier, 1830)
• Onchidium ferrugineum R. P. Lesson, 1831 accepted as Peronia verruculata (Cuvier, 1830)
• Onchidium floridanum Dall, 1885 accepted as Onchidella floridana (Dall, 1885)
• Onchidium fungiforme (Stantschinsky, 1907) accepted as Wallaconchis fungiformis (Stantschinsky, 1907)
• Onchidium glabrum C. Semper, 1880 accepted as Semperoncis glaber (C. Semper, 1880)
• Onchidium graniferum C. Semper, 1880 accepted as Wallaconchis graniferum (C. Semper, 1880) accepted as Wallaconchis graniferus (C. Semper, 1880)
• Onchidium granulosum R. P. Lesson, 1831 (uncertain > nomen dubium)
• Onchidium griseofuscum (Tapparone Canefri, 1874) (uncertain > nomen dubium)
• Onchidium griseum Plate, 1893 (uncertain > nomen dubium)
• Onchidium hardwickii (Gray, 1850) (uncertain > nomen dubium)
• Onchidium harmandianum Rochebrune, 1882 (uncertain > nomen dubium)
• Onchidium hongkongense Britton, 1984 accepted as Paromoionchis tumidus (C. Semper, 1880)
• Onchidium incisum Quoy & Gaimard, 1832 accepted as Onchidella incisa (Quoy & Gaimard, 1832)
• Onchidium laevigatum Cuvier, 1816 accepted as Vaginulus laevigatus A. Férussac, 1822
• Onchidium lanuginosum Hupé, 1854 accepted as Onchidella marginata (Couthouy, 1852)
• Onchidium leopoldi Labbé, 1934 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
• Onchidium lesliei Stearns, 1892 accepted as Onchidella lesliei (Stearns, 1892)
• Onchidium lixii Labbé, 1934 (uncertain > nomen dubium)
• Onchidium luteum C. Semper, 1882 accepted as Platevindex luteus (C. Semper, 1882)
• Onchidium marmoratum R. P. Lesson, 1831 accepted as Marmaronchis marmoratus (R. P. Lesson, 1831)
• Onchidium melakense Dayrat & Goulding, 2019
• Onchidium melanopneumon Bergh, 1884 accepted as Peronia peronii (Cuvier, 1804)
• Onchidium meriakrii Stantschinsky, 1907 accepted as Alionchis meriakrii (Stantschinsky, 1907)
• Onchidium mertoni Simroth, 1920 accepted as Paromoionchis tumidus (C. Semper, 1880)
• Onchidium multinotatum Plate, 1893 (uncertain > nomen dubium)
• Onchidium multiradiatum C. Semper, 1882
• Onchidium nanum R. A. Philippi, 1844 accepted as Onchidella celtica (Audouin & H. Milne Edwards, 1832)
• Onchidium nebulosum C. Semper, 1880
• Onchidium nigricans Quoy & Gaimard, 1832 accepted as Onchidella nigricans (Quoy & Gaimard, 1832)
• Onchidium nigrum Plate, 1893 accepted as Onchidium stuxbergi (Westerlund, 1883)
• Onchidium occidentale Guilding, 1824 accepted as Diplosolenodes occidentalis (Guilding, 1824)
• Onchidium oniscioides Blainville, 1816 accepted as Onchidella oniscioides (Blainville, 1816)
• Onchidium ovale C. Semper, 1880 accepted as Wallaconchis ovalis (C. Semper, 1880)
• Onchidium palaense C. Semper, 1880 (uncertain > nomen dubium)
• Onchidium pallidipes Tapparone Canefri, 1889 accepted as Onchidium stuxbergi (Westerlund, 1883)
• Onchidium pallidum Stoliczka, 1869 (uncertain > nomen dubium)
• Onchidium papuanum C. Semper, 1880 (uncertain > nomen dubium)
• Onchidium patelloide Quoy & Gaimard, 1832 accepted as Onchidella nigricans (Quoy & Gaimard, 1832)
• Onchidium peroni Cuvier, 1804 accepted as Peronia peronii (Cuvier, 1804)
• Onchidium peronii Cuvier, 1804 accepted as Peronia peronii (Cuvier, 1804)
• Onchidium planatum Quoy & Gaimard, 1825 (uncertain > nomen dubium)
• Onchidium platei Hoffmann, 1928 accepted as Peronia platei (Hoffmann, 1928)
• Onchidium ponsonbyi Collinge, 1901 accepted as Semperoncis ponsonbyi (Collinge, 1901)
• Onchidium punctatum Quoy & Gaimard, 1832 accepted as Peronia peronii (Cuvier, 1804)
• Onchidium reevesii (Gray, 1850)
• Onchidium reticulatum C. Semper, 1880 accepted as Onchidella reticulata (C. Semper, 1880) accepted as Onchidella nigricans (Quoy & Gaimard, 1832)
• Onchidium samarense C. Semper, 1882 accepted as Paromoionchis tumidus (C. Semper, 1880)
• Onchidium savignyi C. Semper, 1880 (uncertain)
• Onchidium schrammi Bland & W. G. Binney, 1874 accepted as Onchidella incisa (Quoy & Gaimard, 1832)
• Onchidium secatum Quoy & Gaimard, 1824 (uncertain > nomen dubium)
• Onchidium sloanei Cuvier, 1817 accepted as Veronicella sloanei (Cuvier, 1817) accepted as Veronicella sloanii (Cuvier, 1816) accepted as Leidyula sloanii (Cuvier, 1816)
• Onchidium sloanii Cuvier, 1816 accepted as Leidyula sloanii (Cuvier, 1816)
• Onchidium steenstrupii C. Semper, 1882 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
• Onchidium steindachneri C. Semper, 1880 accepted as Onchidella steindachneri (C. Semper, 1880)
• Onchidium straelenii Labbé, 1934 (uncertain > nomen dubium)
• Onchidium struma accepted as Onchidium reevesii (Gray, 1850)
• Onchidium stuxbergi (Westerlund, 1883)
• Onchidium tenerum Stoliczka, 1869 accepted as Peronina tenera (Stoliczka, 1869)
• Onchidium tigrinum Stoliczka, 1869 accepted as Platevindex tigrinus (Stoliczka, 1869)
• Onchidium tonganum Quoy & Gaimard, 1832 accepted as Peronia peronii (Cuvier, 1804)
• Onchidium transatlanticum Heilprin, 1889 accepted as Onchidella floridana (Dall, 1885)
• Onchidium trans-atlanticum Heilprin, 1889 accepted as Onchidella floridana (Dall, 1885)
• Onchidium trapezoideum C. Semper, 1882 (uncertain > nomen dubium)
• Onchidium tricolor Simroth, 1918 (uncertain > taxon inquirendum)
• Onchidium tuberculatum Taslé, 1870 accepted as Onchidella celtica (Audouin & H. Milne Edwards, 1832)
• Onchidium tumidum C. Semper, 1880 accepted as Paromoionchis tumidus (C. Semper, 1880)
• Onchidium typhae Buchannan, 1800
• Onchidium vaigiense Quoy & Gaimard, 1825 accepted as Marmaronchis vaigiensis (Quoy & Gaimard, 1825)
• Onchidium verruculatum Cuvier, 1830 accepted as Peronia verruculata (Cuvier, 1830)