1. Subgenus Obsoletiforma (Obsoletiforma) Paramonova, 1971 † accepted as Obsoletiformes Kojumdgieva, 1969 † (unaccepted > unjustified emendation)
   1. Species Obsoletiforma (Obsoletiforma) ghergutai (Jekelius, 1944) † accepted as Obsoletiformes ghergutai (Jekelius, 1944) † (genus is an unjustified emendation)
   2. Species Obsoletiforma (Obsoletiforma) pseudosoceni (Jekelius, 1944) † accepted as Obsoletiformes pseudosoceni (Jekelius, 1944) † (genus is an unjustified emendation)
2. Species Obsoletiforma acerba (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes acerbus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
3. Species Obsoletiforma bajarunasi (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes bajarunasi (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
4. Species Obsoletiforma balcicense (Gillet, 1938) † accepted as Obsoletiformes balcicensis (Gillet, 1938) † (unaccepted > superseded combination)
5. Species Obsoletiforma barboti (R. Hoernes, 1874) † accepted as Replidacna barboti (R. Hoernes, 1874) † (unaccepted > superseded combination)
6. Species Obsoletiforma beaumontiana ("A. d'Orbigny, 1844") † accepted as Obsoletiformes obsoletus (Eichwald, 1830) † (unaccepted > junior objective synonym)
7. Species Obsoletiforma centopleura (Andrusov, 1902) † accepted as Obsoletiformes centopleurus (Andrusov, 1902) † (unaccepted > superseded combination, genus is an unjustified emendation)
8. Species Obsoletiforma desperata (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes desperatus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
9. Species Obsoletiforma fischeriana (Doenging, 1852) † accepted as Obsoletiformes fischerianus (Doenging, 1852) † (unaccepted > superseded combination, genus is an unjustified emendation)
10. Species Obsoletiforma fischeriformis (A. Papp, 1954) † accepted as Obsoletiformes fischeriformis (A. Papp, 1954) † (unaccepted > superseded combination, genus is an unjustified emendation)
11. Species Obsoletiforma gatuevi (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes gatuevi (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
12. Species Obsoletiforma gleichenbergense (A. Papp, 1954) † accepted as Replidacna nigra (Zhizhchenko, 1934) † (unaccepted > junior subjective synonym)
13. Species Obsoletiforma incurvata (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes incurvatus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
14. Species Obsoletiforma ingrata (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes obsoletus ingratus (V. P. Kolesnikov, 1929) † (superseded rank and combination)
15. Species Obsoletiforma irregulare (Eichwald, 1830) † accepted as Obsoletiformes irregularis (Eichwald, 1830) † (unaccepted > superseded combination)
16. Species Obsoletiforma karabugasica (Sidorova, 1961) † accepted as Obsoletiformes karabugasicus (Sidorova, 1961) † (unaccepted > superseded combination, genus is an unjustified emendation)
17. Species Obsoletiforma karagiensis (Sidorova, 1961) † accepted as Obsoletiformes karagiensis (Sidorova, 1961) † (unaccepted > superseded combination, genus is an unjustified emendation)
18. Species Obsoletiforma kaundensis (Sidorova, 1961) † accepted as Obsoletiformes kaundensis (Sidorova, 1961) † (unaccepted > superseded combination, genus is an unjustified emendation)
19. Species Obsoletiforma kishinevensis (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes kishinevensis (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
20. Species Obsoletiforma kolesnikovi (Davitashvili, 1932) † accepted as Obsoletiforma beaumontiana ("A. d'Orbigny, 1844") † accepted as Obsoletiformes obsoletus (Eichwald, 1830) † (unaccepted > junior subjective synonym)
21. Species Obsoletiforma lithopodolica (Du Bois de Montpéreux, 1831) † accepted as Obsoletiformes lithopodolicus (Du Bois de Montpéreux, 1831) † (unaccepted > superseded combination, genus is an unjustified emendation)
22. Species Obsoletiforma lucinoidea [sic] † accepted as Obsoletiformes lucinoides (Paramonova, 1977) † (unaccepted > misspelling - incorrect subsequent spelling)
23. Species Obsoletiforma michailovi [sic] † accepted as Obsoletiformes michailowii (Toula, 1892) † (unaccepted > misspelling - incorrect original spelling)
24. Species Obsoletiforma michailowii (Toula, 1892) † accepted as Obsoletiformes michailowii (Toula, 1892) † (unaccepted > superseded combination, genus is an unjustified emendation)
25. Species Obsoletiforma nalivkini (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes nalivkini (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
26. Species Obsoletiforma obliquoobsoleta (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes obliquoobsoletus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
27. Species Obsoletiforma obsoleta (Eichwald, 1830) † accepted as Obsoletiformes obsoletus (Eichwald, 1830) † (unaccepted > superseded combination, genus is an unjustified emendation)
28. Species Obsoletiforma obsoletiformis (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes obsoletiformis (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
29. Species Obsoletiforma praefischeriana (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes praefischerianus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
30. Species Obsoletiforma pseudofischeriana (Sinzov, 1875) † accepted as Obsoletiformes pseudofischerianus (Sinzov, 1875) † (unaccepted > superseded combination, genus is an unjustified emendation)
31. Species Obsoletiforma pseudosemisulcata (Andrusov, 1902) † accepted as Obsoletiformes pseudosemisulcatus (Andrusov, 1902) † (unaccepted > superseded combination, genus is an unjustified emendation)
32. Species Obsoletiforma quadripartita (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes quadripartitus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
33. Species Obsoletiforma sarmatica (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes sarmaticus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
34. Species Obsoletiforma suensis (Sidorova, 1961) † accepted as Obsoletiformes suensis (Sidorova, 1961) † (unaccepted > superseded combination, genus is an unjustified emendation)
35. Species Obsoletiforma venesta (V. P. Kolesnikov, 1929) † accepted as Obsoletiformes venestus (V. P. Kolesnikov, 1929) † (unaccepted > superseded combination, genus is an unjustified emendation)
36. Species Obsoletiforma vindobonense (Laskarev, 1903) † accepted as Obsoletiformes vindobonensis (Laskarev, 1903) † (unaccepted > superseded combination, genus is an unjustified emendation)
37. Species Obsoletiforma zaleszensis Paramonova, 1993 † accepted as Obsoletiformes zaleszensis Paramonova, 1993 † (unaccepted > superseded combination, genus is an unjustified emendation)
38. Species Obsoletiforma zhizhchenki (Steklov, 1955) † accepted as Obsoletiformes zhizhchenki (Steklov, 1955) † (unaccepted > superseded combination, genus is an unjustified emendation)

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