1. Species Unionites albertii (Assman, 1916) †
2. Species Unionites angulata (Trechmann, 1918) †
3. Species Unionites brevis (Schauroth, 1857) †
4. Species Unionites canalensis (Catullo, 1846) †
5. Species Unionites donacinus (Schlotheim, 1820) †
6. Species Unionites edmondiiformis (Trechmann, 1918) †
7. Species Unionites fassaensis (Wissmann, 1841) †
8. Species Unionites ichigualasti (Frenguelli, 1945) †
9. Species Unionites jacobi (Stache, 1878) †
10. Species Unionites kobyumensis Biakov & Kutygin, 2021 †
11. Species Unionites letticus (Quenstedt, 1852) †
12. Species Unionites manmuensis (Reed, 1927) †
13. Species Unionites muensteri Wissmann, 1841 †
14. Species Unionites ovalis (Trechmann, 1918) †
15. Species Unionites riojana (Frenguelli, 1945) †
16. Species Unionites cardiiformis J.-H. Chen, 1976 † accepted as Weiyuanella cardiiformis (J.-H. Chen, 1976) † (unaccepted > superseded combination)
17. Species Unionites damdunensis (Vukhuc, 1965) † accepted as Weiyuanella damdunensis (Vukhuc, 1965) † (unaccepted > superseded combination)
18. Species Unionites ellipticus J.-H. Chen, 1976 † accepted as Weiyuanella elliptica (J.-H. Chen, 1976) † (unaccepted > superseded combination)
19. Species Unionites emeiensis C.-Z. Chen, Q.-H. Ma & Z.-M. Zhang, 1974 † accepted as Weiyuanella emeiensis (C.-Z. Chen, Q.-H. Ma & Z.-M. Zhang, 1974) † (unaccepted > superseded combination)
20. Species Unionites gregarea [sic] † accepted as Unionites gregarius (Quenstedt, 1866) † (unaccepted > misspelling - incorrect subsequent spelling)
21. Species Unionites minimus (Mansuy, 1919) † accepted as Indosinion minimum (Mansuy, 1919) † (unaccepted > superseded combination)
22. Species Unionites rhomboidalis C.-Z. Chen, Q.-H. Ma & Z.-M. Zhang, 1974 † accepted as Weiyuanella rhomboidalis (C.-Z. Chen, Q.-H. Ma & Z.-M. Zhang, 1974) † (unaccepted > superseded combination)
23. Species Unionites trapezoidalis (Mansuy, 1919) † accepted as Indosinion trapezoidalis (Mansuy, 1919) † (unaccepted > superseded combination)
24. Species Unionites convexus (Mansuy) † (uncertain > taxon inquirendum)
25. Species Unionites elisabethae (Patte, 1926) † (uncertain > unassessed)
26. Species Unionites gongxianensis J.-F. Xu, 1978 † (uncertain > unassessed)
27. Species Unionites gregarius (Quenstedt, 1866) † (uncertain > unassessed)
28. Species Unionites griesbachi (Bittner, 1899) † (uncertain > unassessed)
29. Species Unionites guizhouensis C.-Z. Chen, Q.-H. Ma & Z.-M. Zhang, 1974 † (uncertain > unassessed)
30. Species Unionites isocardioides (Frech, 1909) † (uncertain > unassessed)
31. Species Unionites lutrariaeformis (O. Boettger, 1880) † (uncertain > unassessed)
32. Species Unionites nijiaoensis F.-X. Guo, 1985 † (uncertain > unassessed)
33. Species Unionites qiubeiensis F.-X. Guo, 1985 † (uncertain > unassessed)
34. Species Unionites spicatus C.-Z. Chen, Q.-H. Ma & Z.-M. Zhang, 1974 † (uncertain > unassessed)
35. Species Unionites xinyuensis J.-H. Li, 1982 † (uncertain > unassessed)
36. Species Unionites yanyuanensis J.-F. Xu, 1978 † (uncertain > unassessed)
37. Species Unionites zadoensis Z.-M. Zhang, 1979 † (uncertain > unassessed)

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