• Ulnaria (Kützing) P. Compère, 2001
• Ulnaria F.T. Kutzing, 1844
• Ulnaria acus (Kützing) M.Aboal, 2003 accepted as Synedra acus f. acus Kützing, 1844
• Ulnaria amphirhynchus (Ehrenberg) Compère & Bukhtiyarova, 2006 accepted as Synedra amphirhynchus var. amphirhynchus Ehrenberg, 1843
• Ulnaria biceps (Kützing) P.Compère, 2001 accepted as Synedra biceps f. biceps Kützing, 1844
• Ulnaria capitata (Ehrenberg) P.Compère, 2001 accepted as Synedra capitata f. capitata Ehrenberg, 1836
• Ulnaria colcae Van de Vijver & Cocquyt, 2009 (uncertain > unassessed)
• Ulnaria contracta (Østrup) E.A.Morales & M.L.Vis, 2007 accepted as Synedra ulna var. contracta Østrup, 1901
• Ulnaria danica (Kützing) Compère & Bukhtiyarova, 2006 accepted as Synedra danica Kützing, 1844
• Ulnaria delicatissima (W.Smith) M.Aboal & P.C.Silva, 2004 accepted as Synedra delicatissima f. delicatissima W. Smith, 1853
• Ulnaria delicatissima var. angustissima (Grunow) M.Aboal & P.C.Silva, 2004 accepted as Synedra delicatissima var. angustissima Grunow, 1881
• Ulnaria delicatissima var. angutissima (Grunow) M. Aboal & P.C. Silva accepted as Synedra delicatissima var. angustissima Grunow, 1881
• Ulnaria ferefusiformis Kulikovskiy & Lange-Bertalot, 2016
• Ulnaria fragilariaeformis (F.E.Fritsch & M.F. Rich) Williams
• Ulnaria goulardii (Brébisson ex Cleve & Grunow) D.M.Williams, Potapova & C.E.Wetzel in Wetzel et al., 2022
• Ulnaria grunowii (Lange-Bertalot & S.Ulrich) Cantonati & Lange-Bertalot in Kusber, Cantonati & Lange-Bertalot, 2017
• Ulnaria hunanensis Bing Liu in D.M. Williams & Blanco, 2019
• Ulnaria japonica A. Tuji, 2009 (uncertain > unassessed)
• Ulnaria lanceolata (Kützing) P.Compère, 2001 accepted as Synedra lanceolata f. lanceolata Kützing, 1844
• Ulnaria longissima (W.Smith) Van de Vijver & D.M.Williams, 2022
• Ulnaria macilenta E.Morales, C.E.Wetzel & S.F.Rivera, 2013
• Ulnaria oxyrhyncus (Kützing) Aboal in Aboal, Alvarez-Cobelas, Cambra & Ector, 2003 accepted as Synedra oxyrhynchus var. oxyrhynchus Kützing, 1844
• Ulnaria pilum Kulikovskiy & Lange-Bertalot in Kulikovskiy et al., 2020
• Ulnaria ramesii (Héribaud) T. Ohtsuka in Ohtsuka et al., 2007 accepted as Synedra ramesi Héribaud-Joseph, 1903
• Ulnaria rhombus D.M. Williams, 2019
• Ulnaria rostrata (Meister) A. Tuji, 2009 accepted as Synedra rostrata Meister, 1913
• Ulnaria salina (W. Sm.) Gogorev, 2018
• Ulnaria titicacaensis E.Morales, C.E.Wetzel & S.F.Rivera, 2013
• Ulnaria tooelensis C.L.Graeff, J.P.Kociolek & S.R.Rushforth, 2013
• Ulnaria ulna (Nitzsch) P.Compère, 2001 accepted as Synedra ulna var. subcontracta Østrup in Héribaud et al., 1920
• Ulnaria ulna var. acus (Kützing) Lange-Bertalot
• Ulnaria ulna var. aequalis (Kützing) M.Aboal, 2003 accepted as Frustulia aequalis Kützing, 1833
• Ulnaria ulna var. amphirhynchus (Ehrenberg) M.Aboal, 2003 accepted as Synedra amphirhynchus var. amphirhynchus Ehrenberg, 1843
• Ulnaria ulna var. chaseana (B.W.Thomas) Compère, 1982
• Ulnaria ulna var. constricta Maidana & Seeligmann, 2006
• Ulnaria ulna var. notata (Kützing) M.Aboal, 2003 accepted as Synedra notata Kützing, 1844
• Ulnaria ulna var. spathulifera (Grunow) M.Aboal, 2003 accepted as Synedra spathulifera Grunow, 1881
• Ulnaria ulna var. splendens (Kützing) M.Aboal, 2003 accepted as Frustulia splendens Kützing, 1833
• Ulnaria ulna var. subaequalis (Grunow) M.Aboal, 2003 accepted as Synedra subaequalis f. subaequalis Grunow in Van Heurck, 1881
• Ulnaria undulata (Rabenhorst) Williams
• Ulnaria ungeriana (Grunow) P.Compère, 2001 accepted as Fragilaria ungeriana var. ungeriana Grunow in litteris, 1863
• Ulnaria verhaegeniana Van de Vijver, M.de Haan, Mertens & Cocquyt, 2017
• Ulnaria wulingensis Bing Liu, 2019
• Ulnariaceae Cox, 2015