| Species | as Species | Doubtful |
|---|
Connected successfully| Achnanthes brevipes C.A. Agardh, 1824 | | |
| Achnanthes brevipes var. intermedia (Kützing) P.T. Cleve, 1895 | ''Achnanthes subsessilis''; | |
| Achnanthes longipes Agardh, 1824 | | |
| Actinocyclus octonarius Ehrenberg, 1838 | ''Actinocyclus ehrenbergii''; | |
| Actinocyclus octonarius var. crassus (W. Smith) Hendey, 1954 | ''Actinocyclus crassus''; | |
| Amphora angusta Gregory, 1857 | | |
| Amphora costata W. Smith, 1853 | | |
| Amphora hyalina Kützing, 1844 | | |
| Amphora marina W. Smith 1857 | | |
| Amphora ovalis (Kützing) Kützing, 1844 | | |
| Aphanizomenon flos-aquae (Linnaeus) Ralfs ex Bornet & Flahault, 1888 | also ''Anabaena flos-aquae''; | |
| Asterionella gracillima (Hantzsch) Heiberg, 1863 | | |
| Aulacoseira distans (Ehrenberg) Simonsen, 1979 | ''Melosira distans''; | |
| Aulacoseira granulata (Ehrenberg) Simonsen, 1979 | ''Melosira granulata''; | |
| Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 | ''Bacillaria paradoxa''; | |
| Biremis ambigua (Cleve) D.G.Mann, 1990 | ''Navicula retusa''; | |
| Caloneis amphisbaena (Bory) P.T. Cleve, 1894 | ''Navicula amphisbaena''; | |
| Caloneis liber (W. Sm.) Cleve, 1894 | ''Navicula liber''; | |
| Campylodiscus fastuosus Ehrenberg, 1845 | ''Campylodiscus thuretii''; | |
| Cerataulina velifera Mereschkowsky | | |
| Chaetoceros affinis Lauder, 1864 | ''Chaetoceros angulatus''; | |
| Chaetoceros borealis J.W. Bailey, 1854 | | |
| Chaetoceros borealis f. solitaria Cleve | | |
| Chaetoceros compressus Lauder, 1864 | ''Chaetoceros contortus''; | |
| Chaetoceros convolutus Castracane, 1886 | | |
| Chaetoceros curvisetus P.T. Cleve, 1889 | | |
| Chaetoceros diadema (Ehrenberg) Gran, 1897 | ''Chaetoceros groenlandicus''; | |
| Chaetoceros knipowitschii A. Henckel | | |
| Chaetoceros laciniosus Schütt, 1895 | | |
| Chaetoceros mitra (J.W. Bailey) P.T. Cleve, 1896 | | |
| Chaetoceros neogracilis VanLand., 1968 | ''Chaetoceros gracilis''; | |
| Chaetoceros peruvianus Brightw. | | |
| Chaetoceros similis P.T. Cleve, 1896 | | |
| Chaetoceros wighamii Brightwell, 1856 | | |
| Cocconeis placentula var. lineata (Ehrenberg) Van Heurck, 1885 | | |
| Cocconeis scutellum (Grunow in Van Heurck) P.T. Cleve, 1896 | | |
| Coscinodiscus biconicus Van Breemen | | |
| Coscinodiscus gigas Ehrenb. 1841 | | |
| Coscinodiscus granii Gough, 1905 | | |
| Coscinodiscus perforatus (Forti) Hust., 1928 | | |
| Ctenophora pulchella (Ralfs ex Kützing) Williams & Round, 1986 | ''Synedra pulchella f. major''; | |
| Cyclotella meneghiniana Kützing, 1844 | | |
| Cymatopleura elliptica (Brébisson ex Kützing) W. Smith, 1851 | | |
| Cymatopleura solea (Brébisson) W. Smith, 1851 | | |
| Dactyliosolen fragilissimus (Bergon) G. R. Hasle, 1991 | ''Rhizosolenia fragillissima''; | |
| Diatoma tenue C.A. Agardh, 1812 | ''Diatoma elongatum'' and ''Diatoma elongatum var. hybrida''; | |
| Diatoma vulgare Bory de Saint-Vincent, 1824 | | |
| Diploneis elliptica (Kützing) P.T. Cleve, 1894 | ''Navicula elliptica''; | |
| Diploneis smithii (Brébisson in W. Smith) P.T. Cleve, 1894 | ''Navicula smithii''; | |
| Ditylum brightwellii (T. West) Grunow in Van Heurck, 1883 | | |
| Entomoneis alata (Ehrenberg) Ehrenberg, 1845 | ''Amphiprora alata''; | |
| Entomoneis paludosa (W. Smith) Reimer, 1975 | ''Amphiprora paludosa''; | |
| Epithemia adnata (Kützing) Brébisson, 1838 | ''Epithemia zebra''; | |
| Epithemia gibberula (Ehr.) Kutz. | | |
| Fragilaria crotonensis Kitton, 1869 | | |
| Fragilariforma virescens (Ralfs) Williams & Round, 1988 | ''Fragilaria virescens''; | |
| Gomphonema olivaceum (Hornemann) Brébisson, 1838 | | |
| Grammatophora marina (Lyngbye) Kützing, 1844 | | |
| Gyrosigma balticum (Ehrenberg) Rabenhorst | | |
| Gyrosigma spectabile (Grunow) Cleve | ''Nitzschia spectabilis''; | |
| Hemiaulus hauckii Grunow in Van Heurck, 1882 | | |
| Licmophora ehrenbergii (Kützing) Grunow, 1867 | | |
| Licmophora lyngbyei (Kützing) Grunow ex Van Heurck, 1867 | | |
| Lyrella atlantica (Schmidt) D.G.Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 | ''Navicula lyra var. atlantica''; | |
| Lyrella hennedyi (W. Sm.) Stickle & D. G. Mann, 1990 | ''Navicula hennedyi''; | |
| Lyrella lyra (Ehrenb.) Karayeva, 1978 | ''Navicula lyra''; | |
| Melosira borreri Greville, 1833 | | |
| Melosira varians C.A. Agardh, 1827 | | |
| Merismopedia tenuissima Lemmermann, 1898 | | |
| Microcystis aeruginosa (Kützing) Kützing, 1846 | ''Clathrocystis aeruginosa''; | |
| Microcystis ichthyoblabe Kützing, 1843 | | |
| Navicula cancellata Donkin, 1872 | | |
| Navicula digitoradiata (Gregory) Ralfs in Pritchard, 1861 | | |
| Navicula directa (W. Smith) Ralfs in Pritchard, 1861 | ''Pinnularia directa''; | |
| Navicula forcipata Greville, 1859 | | |
| Navicula forcipata var. densistriata A. Schmidt, 1881 | | |
| Navicula palpebralis de Brébisson, 1853 | | |
| Navicula peregrina var. meniscus (J.Schumann) Grunow in Van Heurck, 1895 | | |
| Navicula radiosa Kützing, 1844 | | |
| Navicula rhynchocephala Kützing, 1844 | | |
| Navicula slesvicensis Grunow, 1880 | '' Navicula viridula var. slesvicensis''; | |
| Navicula tripunctata (O.F. Müller) Bory, 1822 | ''Navicula gracilis''; | |
| Navicula vacillans A. Schmidt, 1875 | | |
| Navicula viridula (Kützing) Ehrenberg, 1838 | | |
| Nitzschia constricta (Gregory) Grunow in Cleve & Grunow, 1880 | | |
| Nitzschia constricta f. parva Grunow | | |
| Nitzschia dissipata (Kützing) Grunow, 1862 | | |
| Nitzschia dissipata var. media (Hantzsch) Grunow in van Heurck, 1881 | | |
| Nitzschia lanceolata W. Smith | | |
| Nitzschia obtusa W. Smith, 1853 | | |
| Nitzschia sigma (Kützing) W. Smith, 1853 | | |
| Pediastrum boryanum (Turpin) Meneghini, 1840 | | |
| Pediastrum duplex Meyen, 1829 | also ''Pediastrum duplex var. reticulatum''; | |
| Petrodictyon gemma (Ehrenberg) D.G. Mann in Round et al., 1990 | ''Surirella gemma''; | |
| Petroneis humerosa (Brébisson ex W. Smith) A.J. Stickle & D.G. Mann, 1990 | ''Navicula humerosa''; | |
| Pinnularia directa var. angusta | | |
| Pinnularia quadratarea | | |
| Pinnularia rectangulata (Gregory) Rabenhorst | | |
| Pleurosigma angulatum (Quekett, 1848) Wm. Smith, 1853 | | |
| Pleurosigma formosum Wm. Smith | | |
| Pleurosigma normanii Ralfs in Pritchard. | | |
| Pleurosira laevis (Ehrenberg) Compère, 1982 | ''Biddulphia laevis''; | |
| Proboscia alata (Brightwell) Sundström, 1986 | ''Rhizosolenia alata''; | |
| Psammodictyon panduriforme (Greg.) Mann | ''Nitzschia panduriformis''; | |
| Rafidium fasciculatum Kg. | | |
| Rhoicosphenia abbreviata (C.A. Agardh) Lange-Bertalot, 1980 | ''Rhoicosphenia curvata''; | |
| Scenedesmus acuminatus (Lagerheim) Chodat, 1902 | | |
| Skeletonema costatum (Greville) P.T. Cleve, 1878 | | |
| Stauronella constricta (Ehrenberg) K.S.Mereschkowsky | | |
| Stenopterobia delicatissima (Lewis) Brébisson ex Van Heurck, 1896 | ''Synedra acus var. delicatissima''; | |
| Stephanodiscus hantzschii Grunow in P.T. Cleve & Grunow, 1880 | | |
| Surirella fastuosa (Ehrenberg) Kützing, 1844 | | |
| Surirella ovalis Brébisson, 1838 | | |
| Surirella striatula Turpin, 1828 | | |
| Synedra affinis Kützing, 1844 | | |
| Synedra capitata Ehrenberg, 1836 | | |
| Synedra gaillonii (Bory de Saint-Vincent) Ehrenberg, 1834 | | |
| Tabularia fasciculata (C. Agardh) D.M. Williams & Round, 1986 | ''Synedra affinis var. tabulata'' and ''Synedra affinis var. fasciculata''; | |
| Thalassionema nitzschioides (Grunow, 1862) Van Heurck, 1896 | ''Thalassiothrix nitzschioides''; | |
| Thalassiosira gravida P.T. Cleve, 1896 | | |
| Toxarium undulatum J.W. Bailey, 1854 | ''Synedra undulata''; | |
| Trachyneis aspera (Ehrenberg) Cleve | ''Stauroneis aspera''; | |
| Tryblionella apiculata Gregory, 1857 | ''Nitzschia apiculata''; | |
| Tryblionella compressa (J.W. Bailey) M. Poulin in Poulin et al., 1990 | ''Nitzschia punctata''; | |
| Tryblionella levidensis W. Smith, 1856 | ''Nitzschia tryblionella var. levidensis''; | |
| Ulnaria ulna (Nitzsch) P. Compère in Jahn et al., 2001 | ''Synedra ulna''; | |