1. Species Ulnaria ferefusiformis Kulikovskiy & Lange-Bertalot, 2016
2. Species Ulnaria fragilariaeformis (F.E.Fritsch & M.F. Rich) Williams
3. Species Ulnaria goulardii (Brébisson ex Cleve & Grunow) D.M.Williams, Potapova & C.E.Wetzel in Wetzel et al., 2022
4. Species Ulnaria grunowii (Lange-Bertalot & S.Ulrich) Cantonati & Lange-Bertalot in Kusber, Cantonati & Lange-Bertalot, 2017
5. Species Ulnaria hunanensis Bing Liu in D.M. Williams & Blanco, 2019
6. Species Ulnaria longissima (W.Smith) Van de Vijver & D.M.Williams, 2022
7. Species Ulnaria macilenta E.Morales, C.E.Wetzel & S.F.Rivera, 2013
8. Species Ulnaria pilum Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2020
9. Species Ulnaria rhombus D.M. Williams, 2019
10. Species Ulnaria salina (W. Sm.) Gogorev, 2018
11. Species Ulnaria titicacaensis E.Morales, C.E.Wetzel & S.F.Rivera, 2013
12. Species Ulnaria tooelensis C.L.Graeff, J.P.Kociolek & S.R.Rushforth, 2013
13. Species Ulnaria undulata (Rabenhorst) Williams
14. Species Ulnaria verhaegeniana Van de Vijver, M.de Haan, Mertens & Cocquyt, 2017
15. Species Ulnaria wulingensis Bing Liu, 2019
16. Species Ulnaria acus (Kützing) M.Aboal, 2003 accepted as Synedra acus f. acus Kützing, 1844 (uncertain > unassessed)
17. Species Ulnaria amphirhynchus (Ehrenberg) Compère & Bukhtiyarova, 2006 accepted as Synedra amphirhynchus var. amphirhynchus Ehrenberg, 1843 (uncertain > unassessed)
18. Species Ulnaria biceps (Kützing) P.Compère, 2001 accepted as Synedra biceps f. biceps Kützing, 1844 (uncertain > unassessed)
19. Species Ulnaria capitata (Ehrenberg) P.Compère, 2001 accepted as Synedra capitata f. capitata Ehrenberg, 1836 (uncertain > unassessed)
20. Species Ulnaria colcae Van de Vijver & Cocquyt, 2009 (uncertain > unassessed)
21. Species Ulnaria contracta (Østrup) E.A.Morales & M.L.Vis, 2007 accepted as Synedra ulna var. contracta Østrup, 1901 (uncertain > unassessed)
22. Species Ulnaria danica (Kützing) Compère & Bukhtiyarova, 2006 accepted as Synedra danica Kützing, 1844 (uncertain > unassessed)
23. Species Ulnaria delicatissima (W.Smith) M.Aboal & P.C.Silva, 2004 accepted as Synedra delicatissima f. delicatissima W. Smith, 1853 (uncertain > unassessed)
24. Species Ulnaria japonica A. Tuji, 2009 (uncertain > unassessed)
25. Species Ulnaria lanceolata (Kützing) P.Compère, 2001 accepted as Synedra lanceolata f. lanceolata Kützing, 1844 (uncertain > unassessed)
26. Species Ulnaria oxyrhyncus (Kützing) Aboal in Aboal, Alvarez-Cobelas, Cambra & Ector, 2003 accepted as Synedra oxyrhynchus var. oxyrhynchus Kützing, 1844 (uncertain > unassessed)
27. Species Ulnaria ramesii (Héribaud) T. Ohtsuka in Ohtsuka et al., 2007 accepted as Synedra ramesi Héribaud-Joseph, 1903 (uncertain > unassessed)
28. Species Ulnaria rostrata (Meister) A. Tuji, 2009 accepted as Synedra rostrata Meister, 1913 (uncertain > unassessed)
29. Species Ulnaria ulna (Nitzsch) P.Compère, 2001 accepted as Synedra ulna var. subcontracta Østrup in Héribaud et al., 1920 (uncertain > unassessed)
30. Species Ulnaria ungeriana (Grunow) P.Compère, 2001 accepted as Fragilaria ungeriana var. ungeriana Grunow in litteris, 1863 (uncertain > unassessed)

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