1. Species Monotis alaskana (J. P. Smith, 1927) †
2. Species Monotis anjuensis Bychkov & Efimova, 1966 †
3. Species Monotis digona Kittl, 1912 †
4. Species Monotis haueri Kittl, 1912 †
5. Species Monotis hoernesi Kittl, 1912 †
6. Species Monotis kaukasica (Wittenburg, 1923) †
7. Species Monotis limaeformis Gemmellaro, 1882 †
8. Species Monotis megalota Mojsisovics, 1873 †
9. Species Monotis salinaria (Schlotheim, 1820) †
10. Subgenus Monotis (Baikalomonotis) Bychkov, 2007 † accepted as Baikalomonotis Bychkov, 2007 † (unaccepted > superseded rank)
11. Subgenus Monotis (Entomonotis) Marwick, 1935 † accepted as Entomonotis Marwick, 1935 †
    1. Species Monotis (Entomonotis) subcircularis Gabb, 1864 † accepted as Pacimonotis subcircularis (Gabb, 1864) † (unaccepted > superseded combination)
12. Subgenus Monotis (Eomonotis) Grant-Mackie, 1978 † accepted as Eomonotis Grant-Mackie, 1978 † (superseded combination)
    1. Species Monotis (Eomonotis) diptonensis Grant-Mackie, 1980 † accepted as Eomonotis diptonensis (Grant-Mackie, 1980) † (unaccepted > superseded combination)
    2. Species Monotis (Eomonotis) kiritehereensis Grant-Mackie, 1980 † accepted as Eomonotis kiritehereensis (Grant-Mackie, 1980) † (superseded combination)
    3. Species Monotis (Eomonotis) marwicki Grant-Mackie, 1980 † accepted as Eomonotis marwicki (Grant-Mackie, 1980) † (superseded combination)
    4. Species Monotis (Eomonotis) murihikuensis Grant-Mackie, 1980 † accepted as Eomonotis murihikuensis (Grant-Mackie, 1980) † (superseded combination)
    5. Species Monotis (Eomonotis) rauparaha Grant-Mackie, 1980 † accepted as Eomonotis rauparaha (Grant-Mackie, 1980) † (superseded combination)
    6. Species Monotis (Eomonotis) wairakae Grant-Mackie, 1980 † accepted as Eomonotis wairakae (Grant-Mackie, 1980) † (superseded combination)
13. Subgenus Monotis (Inflatomonotis) Grant-Mackie, 1978 † accepted as Inflatomonotis Grant-Mackie, 1978 † (superseded combination)
    1. Species Monotis (Inflatomonotis) warepana Grant-Mackie, 1980 † accepted as Inflatomonotis warepana (Grant-Mackie, 1980) † (superseded combination)
14. Subgenus Monotis (Maorimonotis) Grant-Mackie, 1978 † accepted as Maorimonotis Grant-Mackie, 1978 † (superseded combination)
    1. Species Monotis (Maorimonotis) awakinoensis Grant-Mackie, 1978 † accepted as Maorimonotis awakinoensis (Grant-Mackie, 1980) † (superseded combination)
    2. Species Monotis (Maorimonotis) maniapotoi Grant-Mackie, 1978 † accepted as Maorimonotis maniapotoi (Grant-Mackie, 1980) † (superseded combination)
15. Subgenus Monotis (Monotis) Bronn, 1830 † accepted as Monotis Bronn, 1830 † (unaccepted > superseded rank)
    1. Species Monotis (Monotis) salinaria (Schlotheim, 1820) † accepted as Monotis salinaria (Schlotheim, 1820) † (unaccepted > superseded combination)
16. Subgenus Monotis (Praemonotis) Bychkov, 2007 † accepted as Praemonotis Bychkov, 2007 † (unaccepted > superseded rank)
17. Species Monotis alberti Goldfuss, 1835 † accepted as Leptochondria alberti (Goldfuss, 1835) † (unaccepted > superseded combination)
18. Species Monotis bregeri Girty, 1927 † accepted as Leptochondria curtocardinalis (J. Hall & Whitfield, 1877) † (unaccepted > junior subjective synonym)
19. Species Monotis calvata Marwick, 1953 † accepted as Maorimonotis calvata (Marwick, 1953) † (superseded combination)
20. Species Monotis dissimilis J. C. Cox, 1878 † accepted as Otapiria dissimilis (J. C. Cox, 1878) † (unaccepted > superseded combination)
21. Species Monotis ochotica (Keyserling, 1848) † accepted as Entomonotis ochotica (Keyserling, 1848) † (unaccepted > superseded combination)
22. Species Monotis princeps Conrad, 1838 † accepted as Pseudaviculopecten princeps (Conrad, 1838) † (unaccepted > superseded combination)
23. Species Monotis routhieri Avias, 1953 † accepted as Maorimonotis routhieri (Avias, 1953) †
24. Species Monotis semiplicata Hyatt, 1894 † accepted as Posidonotis semiplicata (Hyatt, 1894) † (unaccepted > superseded combination)
25. Species Monotis subcircularis Gabb, 1864 † accepted as Pacimonotis subcircularis (Gabb, 1864) †
26. Species Monotis symmetrica Hyatt, 1894 † accepted as Posidonotis semiplicata (Hyatt, 1894) † (subjective synonym)
27. Species Monotis thaynesiana Girty, 1927 † accepted as Leptochondria curtocardinalis (J. Hall & Whitfield, 1877) † (unaccepted > junior subjective synonym)
28. Species Monotis decussata Münster, 1835 † (uncertain > unassessed)
29. Species Monotis lineata Münster, 1835 † (uncertain > unassessed)
30. Species Monotis similis Münster, 1835 † (uncertain > unassessed)
31. Species Monotis substriata Münster, 1835 † (uncertain > unassessed)

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