1. Subgenus Crassiana (Pristinunio) Starobogatov, 1970 † accepted as Pristinunio Starobogatov, 1970 † (unaccepted > superseded rank)
2. Species Crassiana angarensis Popova, 1981 † accepted as Unio angarensis (Popova, 1981) † (unaccepted > superseded combination)
3. Species Crassiana bogdanovkaense Gozhik, 1978 † accepted as Unio bogdanovkaensis (Gozhik, 1978) † (incorrect gender agreement; superseded combination)
4. Species Crassiana bugense Gozhik, 1978 † accepted as Unio bugensis (Gozhik, 1978) † (incorrect gender agreement; superseded combination)
5. Species Crassiana crassoides (Chepalyga, 1967) † accepted as Unio crassoides Chepalyga, 1967 † (unaccepted > superseded combination)
6. Species Crassiana irinae Tolstikova, 1976 † accepted as Unio irinae (Tolstikova, 1976) † (unaccepted > superseded combination)
7. Species Crassiana jalpuchae Gozhik, 2002 † accepted as Unio jalpuchae (Gozhik, 2002) † (unaccepted > superseded combination)
8. Species Crassiana nicopolica [sic] † accepted as Crassiana nicopolis (Jatsko, 1955) † accepted as Unio nicopolis Jatsko, 1955 † (unaccepted > misspelling - incorrect subsequent spelling)
9. Species Crassiana nicopolis (Jatsko, 1955) † accepted as Unio nicopolis Jatsko, 1955 † (unaccepted > superseded combination)
10. Species Crassiana nurensis Tolstikova, 1976 † accepted as Unio nurensis (Tolstikova, 1976) † (unaccepted > superseded combination)
11. Species Crassiana osadtschenkoae (Jatsko, 1954) † accepted as Unio osadtschenkoae Jatsko, 1954 † (unaccepted > superseded combination)
12. Species Crassiana ovoidea Gozhik, 2002 † accepted as Unio ovoideus (Gozhik, 2002) † (unaccepted > superseded combination)
13. Species Crassiana praecrassoides Sidnev, 1976 † accepted as Unio praecrassoides (Sidnev, 1976) † (unaccepted > superseded combination)
14. Species Crassiana praerobusta Gozhik, 2006 † accepted as Unio praerobustus (Gozhik, 2006) † (unaccepted > superseded combination)
15. Species Crassiana pseudodavilai Rudiuk † (unaccepted > nomen nudum)
16. Species Crassiana schleschi (Modell, 1935) † accepted as Unio schleschi Modell, 1935 † (unaccepted > superseded combination)
17. Species Crassiana subbugense Gozhik, 1978 † accepted as Unio subbugensis (Gozhik, 1978) † (incorrect gender agreement; superseded combination)
18. Species Crassiana subcrassa (G. I. Popov, 1968) † accepted as Unio subcrassus G. I. Popov, 1968 † (unaccepted > superseded combination)
19. Species Crassiana subnicopolica [sic] † accepted as Crassiana subnicopolis Gozhik, 1978 † accepted as Unio subnicopolis (Gozhik, 1978) † (unaccepted > misspelling - incorrect subsequent spelling)
20. Species Crassiana subnicopolis Gozhik, 1978 † accepted as Unio subnicopolis (Gozhik, 1978) † (unaccepted > superseded combination)
21. Species Crassiana trapezoidea Gozhik, 2006 † accepted as Unio trapezoideus (Gozhik, 2006) † (unaccepted > superseded combination)
22. Species Crassiana uschcalcensis (Jatsko, 1955) † accepted as Unio uschcalcensis Jatsko, 1955 † (unaccepted > superseded combination)
23. Species Crassiana wolffi (Modell, 1931) † accepted as Unio wolffi Modell, 1931 † (unaccepted > superseded combination)
24. Species Crassiana wolfi [sic] † accepted as Unio wolffi Modell, 1931 † (unaccepted > misspelling - incorrect subsequent spelling)
25. Species Crassiana robusta (Chepalyga) † (uncertain)

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