1. Species Fragilariopsis barbieri (M. Peragallo) Cefarelli, Ferrario & Lundholm, 2021
2. Species Fragilariopsis curta (Van Heurck) Hustedt, 1958
3. Species Fragilariopsis doliolus (Wallich) Medlin & P.A.Sims, 1993
4. Species Fragilariopsis jouseae (Burckle) D.M.Williams & Kociolek, 2018 †
5. Species Fragilariopsis kanayae D.M.Williams & Kociolek, 2018 †
6. Species Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
7. Species Fragilariopsis pacifica Lundholm & Hasle, 2010
8. Species Fragilariopsis peragallii (Hasle) Cremer, 2003
9. Species Fragilariopsis antarctica (Castracane) Hustedt, 1913 accepted as Fragilariopsis kerguelensis (O'Meara) Hustedt, 1952 accepted as Terebraria kerguelensis E.O'Meara, 1876 †
10. Species Fragilariopsis drakei J.Frenguelli & H.A.Orlando, 1958 (unaccepted > nomen nudum, invalidly published)
11. Species Fragilariopsis rhombica (O'Meara) Hustedt, 1952 accepted as Diatoma rhombica E.O'Meara, 1877 (synonym)
12. Species Fragilariopsis sublinearis (Van Heurck) Heiden & Kolbe, 1943 accepted as Fragilariopsis obliquecostata (van Heurck) Heiden, 1928 (synonym)
13. Species Fragilariopsis acuta Hajós, 1973 (uncertain > unassessed)
14. Species Fragilariopsis acuta Hajós, 1974 (uncertain > unassessed)
15. Species Fragilariopsis arcula (Gersonde) Gersonde & Barcena, 1998 accepted as Nitzschia arcula Gersonde, 1991 (uncertain > unassessed)
16. Species Fragilariopsis atlantica Paasche, 1961 (uncertain > unassessed)
17. Species Fragilariopsis aurica (Gersonde) Gersonde & Barcena, 1998 accepted as Nitzschia aurica Gersonde, 1991 (uncertain > unassessed)
18. Species Fragilariopsis australis V.V.Muchina, 1965 (uncertain > unassessed)
19. Species Fragilariopsis barronii (Gersonde) Gersonde & Barcena, 1998 accepted as Nitzschia barronii Gersonde, 1991 (uncertain > unassessed)
20. Species Fragilariopsis bjoernoeyaensis Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996 (uncertain > unassessed)
21. Species Fragilariopsis claviceps (Schrader) Censarek & Gersonde, 2002 accepted as Nitzschia claviceps Schrader, 1976 (uncertain > unassessed)
22. Species Fragilariopsis cylindrica (Burckle) Censarek & Gersonde, 2002 accepted as Nitzschia cylindrica Burckle, 1972 (uncertain > unassessed)
23. Species Fragilariopsis cylindriformis (Hasle) Hasle, 1993 (uncertain > unassessed)
24. Species Fragilariopsis cylindrus (Grunow) Krieger, 1954 (uncertain > unassessed)
25. Species Fragilariopsis donahuensis (Schrader) Censarek & Gersonde, 2002 accepted as Nitzschia donahuensis Schrader, 1976 (uncertain > unassessed)
26. Species Fragilariopsis efferans (Schrader) Censarek & Gersonde, 2002 accepted as Nitzschia efferans Schrader, 1976 (uncertain > unassessed)
27. Species Fragilariopsis fossilis (Frenguelli) Medlin & Sims, 1993 † accepted as Pseudonitzschia fossilis var. fossilis Frenguelli, 1949 (uncertain > unassessed)
28. Species Fragilariopsis humboldtianorum Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996 (uncertain > unassessed)
29. Species Fragilariopsis interfrigidaria (McCollum) Gersonde & Barcena, 1998 (uncertain > unassessed)
30. Species Fragilariopsis kerguelensis (O'Meara) Hustedt, 1952 accepted as Terebraria kerguelensis E.O'Meara, 1876 † (uncertain > unassessed)
31. Species Fragilariopsis lacrima (Gersonde) Gersonde & Barcena, 1998 accepted as Nitzschia lacrima Gersonde, 1991 (uncertain > unassessed)
32. Species Fragilariopsis lanceolata Donahue, 1970 (uncertain > unassessed)
33. Species Fragilariopsis linearis (Castracane) Frenguelli, 1943 accepted as Fragilaria linearis f. linearis Castracane, 1886 (uncertain > unassessed)
34. Species Fragilariopsis maleinterpretaria (Schrader) Censarek & Gersonde, 2002 accepted as Nitzschia maleinterpretaria Schrader, 1976 (uncertain > unassessed)
35. Species Fragilariopsis matuyamae Gersonde & Barcena, 1998 (uncertain > unassessed)
36. Species Fragilariopsis miocenica (Burckle) Censarek & Gersonde, 2002 accepted as Nitzschia miocenica Burckle, 1972 (uncertain > unassessed)
37. Species Fragilariopsis nana (Steemann Nielsen) Paasche, 1961 accepted as Fragilaria nana Steemann Nielsen, 1935 (uncertain > unassessed)
38. Species Fragilariopsis oceanica (Cleve) Hasle, 1965 accepted as Fragilaria oceanica f. oceanica Cleve, 1873 (uncertain > unassessed)
39. Species Fragilariopsis pliocena (Brun) Sheshukova-Poretskaya, 1967 accepted as Fragilaria pliocena var. pliocena Brun, 1891 (uncertain > unassessed)
40. Species Fragilariopsis pliocenum (Brun) Scheschukova-Poretskaya, 1959 accepted as Fragilaria pliocena var. pliocena Brun, 1891 (uncertain > unassessed)
41. Species Fragilariopsis praecurta (Gersonde) Gersonde & Barcena, 1998 accepted as Nitzschia praecurta Gersonde, 1991 (uncertain > unassessed)
42. Species Fragilariopsis praeinterfrigidaria (McCollum) Gersonde & Barcena, 1998 (uncertain > unassessed)
43. Species Fragilariopsis pseudonana (Hasle) Hasle, 1993 (uncertain > unassessed)
44. Species Fragilariopsis pusilla (Schrader) Censarek & Gersonde, 2002 accepted as Nitzschia pusilla Schrader, 1976 (uncertain > unassessed)
45. Species Fragilariopsis reginae-jahniae Witkowski, Lange-Bertalot & Metzeltin, 2000 (uncertain > unassessed)
46. Species Fragilariopsis ritscheri Hustedt, 1958 (uncertain > unassessed)
47. Species Fragilariopsis separanda Hustedt, 1958 (uncertain > unassessed)
48. Species Fragilariopsis truncata H.T. Brady ex M.P. Olney in Olney et al., 2007 (uncertain > unassessed)
49. Species Fragilariopsis vanheurckii (Peragallo) Hustedt, 1958 accepted as Fragilaria vanheurckii Peragallo, 1921 (uncertain > unassessed)
50. Species Fragilariopsis weaveri (Ciesielski) Gersonde & Barcena, 1998 accepted as Nitzschia weaveri Ciesielski, 1983 (uncertain > unassessed)

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