1. Species Ulnaria salina (W. Sm.) Gogorev, 2018
2. Species Ulnaria acus (Kützing) M.Aboal, 2003 accepted as Synedra acus f. acus Kützing, 1844 (uncertain > unassessed)
3. Species Ulnaria delicatissima (W.Smith) M.Aboal & P.C.Silva, 2004 accepted as Synedra delicatissima f. delicatissima W. Smith, 1853 (uncertain > unassessed)
4. Species Ulnaria ulna (Nitzsch) P.Compère, 2001 accepted as Synedra ulna var. subcontracta Østrup in Héribaud et al., 1920 (uncertain > unassessed)

marine, brackish, fresh, terrestrial

recent + fossil

Kützing, F.T. (1844). Die Kieselschaligen. Bacillarien oder Diatomeen. <em>Nordhausen.</em> 152 pp., 30 pls., available online at https://doi.org/10.5962/bhl.title.64360 [details] 

Kociolek, J.P.; Blanco, S.; Coste, M.; Ector, L.; Liu, Y.; Karthick, B.; Kulikovskiy, M.; Lundholm, N.; Ludwig, T.; Potapova, M.; Rimet, F.; Sabbe, K.; Sala, S.; Sar, E.; Taylor, J.; Van de Vijver, B.; Wetzel, C.E.; Williams, D.M.; Witkowski, A.; Witkowski, J. (2021). DiatomBase. Ulnaria (Kützing) P. Compère, 2001. Accessed through: Kennedy, M.K., L. Van Guelpen, G. Pohle, L. Bajona (Eds.) (2021) Canadian Register of Marine Species at: http://www.marinespecies.org/carms./aphia.php?p=taxdetails&id=416120 on 2025-05-09

Nozères, C., Kennedy, M.K. (Eds.) (2025). Canadian Register of Marine Species. Ulnaria (Kützing) P. Compère, 2001. Accessed at: https://www.marinespecies.org/CaRMS/aphia.php?p=taxdetails&id=416120 on 2025-05-09

[taxonomic tree]