Aneumastus stroesei (Østrup) D.G.Mann, 1990 accepted as Navicula tuscula var. stroesei Østrup, 1910 (new combination reference)
Aneumastus tuscula (Ehrenberg) D.G.Mann & A.J.Stickle, 1990 † accepted as Navicula tuscula f. tuscula Ehrenberg, 1840 (new combination reference)
Aneumastus tusculoides (A.Cleve) D.G.Mann, 1990 accepted as Navicula tusculoides var. tusculoides Cleve-Euler, 1953 (new combination reference)
Asterionellopsis glacialis (Castracane) Round, 1990 accepted as Asterionella glacialis Castracane, 1886 (new combination reference)
Asterionellopsis kariana (Grunow) Round, 1990 accepted as Asterionella kariana Grunow, 1880 (new combination reference)
Biremis ambigua (Cleve) D.G.Mann, 1990 accepted as Pinnularia ambigua var. ambigua Cleve, 1895 (new combination reference)
Biremis baculus (Hustedt) D.G.Mann, 1990 accepted as Mastogloia baculus Hustedt, 1933 (new combination reference)
Biremis digitus (A.Schmidt) D.G.Mann, 1990 accepted as Amphora digitus A.Schmidt, 1875 (new combination reference)
Biremis fritschii (Salah) D.G.Mann, 1990 accepted as Pinnularia fritschii var. fritschii Salah, 1953 (new combination reference)
Biremis ridicula (M.H.Giffen) D.G.Mann, 1990 accepted as Amphora ridicula Giffen, 1976 (new combination reference)
Bleakeleya notata (Grunow) Round, 1990 accepted as Asterionella bleakeleyi var. notata Grunow, 1867 (new combination reference)
Brachysira atacamae (Hustedt) D.G.Mann, 1990 † (new combination reference)
Brachysira longirostris (Hustedt) D.G.Mann, 1990 accepted as Anomoeoneis longirostris Hustedt, 1942 (new combination reference)
Brachysira rhomboides (Hustedt) D.G.Mann, 1990 accepted as Anomoeoneis rhomboides Hustedt, 1942 (new combination reference)
Cavinula cocconeiformis (Gregory ex Greville) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula cocconeiformis f. cocconeiformis Gregory ex Greville, 1855 (new combination reference)
Cavinula jaernefeltii (Hustedt) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula jaernefeltii Hustedt, 1942 (new combination reference)
Cavinula lacustris (W.Gregory) D.G.Mann & Stickle, 1990 accepted as Navicula lacustris f. lacustris Gregory, 1856 (new combination reference)
Cavinula pseudoscutiformis (Hustedt) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula pseudoscutiformis Hustedt, 1930 (new combination reference)
Cavinula scutiformis (Grunow ex A.Schmidt) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula scutiformis f. scutiformis Grunow in Schmidt et al., 1881 (new combination reference)
Cavinula variostriata (Krasske) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula variostriata var. variostriata Krasske, 1923 (new combination reference)
Cosmioneis delawarensis (Grunow ex Cleve) D.G.Mann, 1990 accepted as Navicula delawarensis Grunow ex Cleve, 1893 (new combination reference)
Cosmioneis grossepunctata (Hustedt) D.G.Mann, 1990 accepted as Navicula grossepunctata Hustedt, 1944 (new combination reference)
Cosmioneis lundstroemii (Cleve) D.G.Mann, 1990 accepted as Navicula lundstroemii var. lundstroemii Cleve in Cleve & Grunow, 1880 (new combination reference)
Cosmioneis pusilla (W.Smith) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula pusilla f. pusilla W. Smith, 1853 (new combination reference)
Craticula accomoda (Hustedt) D.G.Mann, 1990 accepted as Navicula accommoda Hustedt in Messikommer, 1950 (new combination reference)
Craticula ambigua (Ehrenberg) D.G.Mann, 1990 accepted as Navicula ambigua f. ambigua Ehrenberg, 1843 (new combination reference)
Craticula cuspidata (Kutzing) D.G.Mann, 1990 accepted as Frustulia cuspidata Kutzing, 1833 (new combination reference)
Craticula halophila (Grunow) D.G.Mann, 1990 accepted as Navicula cuspidata var. halophila Grunow, 1885 (new combination reference)
Diadesmis aerophila (Krasske) D.G.Mann, 1990 accepted as Humidophila aerophila (Krasske) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014 (new combination reference)
Diadesmis brekkaensis (J.B.Petersen) D.G.Mann, 1990 accepted as Navicula brekkaensis f. brekkaensis Petersen, 1928 (new combination reference)
Diadesmis contenta (Grunow) D.G.Mann, 1990 accepted as Navicula contenta f. contenta Grunow in Van Heurck, 1885 (new combination reference)
Diadesmis laevissima (Cleve) Mann, 1990 accepted as Fragilaria laevissima Cleve, 1898 (new combination reference)
Diadesmis perpusilla (Grunow) D.G.Mann, 1990 accepted as Navicula perpusilla var. perpusilla Grunow, 1860 (new combination reference)
Drepanotheca H.-J. Schrader ex Round, Crawford & Mann, 1990 † (original description)
Encyonema alpinum (Grunow) D.G.Mann, 1990 accepted as Cymbella alpina f. alpina Grunow, 1863 (new combination reference)
Encyonema braunii (Hustedt) D.G.Mann, 1990 accepted as Cymbella braunii Hustedt, 1955 accepted as Encyonopsis braunii (Hustedt) Krammer, 1997 (new combination reference)
Encyonema brehmii (Hustedt) D.G.Mann, 1990 accepted as Cymbella brehmii Hustedt, 1912 (new combination reference)
Encyonema elginense (Krammer) D.G.Mann, 1990 (new combination reference)
Encyonema formosum (Hustedt) D.G.Mann, 1990 accepted as Cymbella formosa Hustedt, 1955 (new combination reference)
Encyonema grossestriatum (O.Müller) D.G.Mann, 1990 accepted as Cymbella grossestriata Otto Müller, 1905 (new combination reference)
Encyonema javanicum (Hustedt) D.G.Mann, 1990 accepted as Cymbella javanica Hustedt, 1938 (new combination reference)
Encyonema juriljii (Hustedt) D.G.Mann, 1990 accepted as Cymbella juriljii Hustedt, 1955 (new combination reference)
Encyonema lacustre (C.Agardh) F.W.Mills, 1934 accepted as Schizonema lacustre C.Agardh, 1824 (new combination reference)
Encyonema latens (Krasske) D.G.Mann, 1990 accepted as Cymbella latens Krasske, 1937 (new combination reference)
Encyonema mesianum (Cholnoky) D.G.Mann, 1990 accepted as Cymbella mesiana Cholnoky, 1955 (new combination reference)
Encyonema minutum (Hilse) D.G.Mann, 1990 accepted as Cymbella minuta Hilse, 1862 (new combination reference)
Encyonema muelleri (Hustedt) D.G.Mann, 1990 accepted as Cymbella muelleri Hustedt, 1937 (new combination reference)
Encyonema obscurum (Krasske) D.G.Mann, 1990 accepted as Cymbella obscura Krasske, 1938 (new combination reference)
Encyonema paucistriatum (Cleve-Euler) D.G.Mann, 1990 accepted as Cymbella paucistriata Cleve-Euler, 1934 (new combination reference)
Encyonema perpusillum (Cleve) D.G.Mann, 1990 accepted as Cymbella perpusilla A.Cleve, 1895 (new combination reference)
Encyonema reichardtii (Krammer) D.G.Mann, 1990 accepted as Cymbella reichardtii Krammer, 1985 (new combination reference)
Encyonema rugosum (Hustedt) D.G.Mann, 1990 accepted as Cymbella rugosa Hustedt, 1955 (new combination reference)
Encyonema silesiacum (Bleisch) D.G.Mann, 1990 accepted as Cymbella silesiaca Bleisch, 1864 (new combination reference)
Encyonema spiculum (Hustedt) D.G.Mann, 1990 accepted as Cymbella spicula Hustedt, 1938 accepted as Kurtkrammeria spicula (Hust.) Ohtsuka, 2018 (new combination reference)
Encyonema subalpinum (Hustedt) D.G.Mann, 1990 accepted as Encyonopsis subalpina (Hustedt) Krammer, 1997 (new combination reference)
Encyonema subturgidum (Hustedt) D.G.Mann, 1990 accepted as Cymbella subturgida Hustedt, 1942 accepted as Encyonema neosubturgidum (Hustedt, 1942) Da Silva, W. J. & M. Menezes, 2016 (new combination reference)
Encyonema tenuissimum (Hustedt) D.G.Mann, 1990 accepted as Cymbella tenuissima Hustedt, 1942 (new combination reference)
Fallacia aequorea (Hustedt) Mann, 1990 accepted as Navicula aequorea Hustedt, 1939 (new combination reference)
Fallacia amphipleuroides (Hustedt) D.G.Mann, 1990 accepted as Navicula amphipleuroides Hustedt, 1955 (new combination reference)
Fallacia bioculata (Grunow ex A.Schmidt) D.G.Mann, 1990 accepted as Navicula bioculata var. bioculata Grunow in Schmidt et al., 1881 (new combination reference)
Fallacia brachium (Hustedt) D.G.Mann, 1990 accepted as Navicula brachium Hustedt, 1944 (new combination reference)
Fallacia clipeiformis (D.König) D.G.Mann, 1990 accepted as Navicula clipeiformis D.König, 1959 (new combination reference)
Fallacia cryptolyra (Brockmann) Stickle & Mann, 1990 accepted as Navicula cryptolyra Brockmann, 1950 (new combination reference)
Fallacia diploneoides (Hustedt) Mann in Round, Crawford & Mann, 1990 (new combination reference)
Fallacia dithmarsica (König ex Hustedt) Mann, 1990 accepted as Navicula dithmarsica König ex Hustedt, 1964 (new combination reference)
Fallacia egregia (Hustedt) D.G.Mann, 1990 accepted as Navicula egregia f. egregia Hustedt, 1942 (new combination reference)
Fallacia fenestrella (Hustedt) D.G.Mann, 1990 accepted as Navicula fenestrella Hustedt, 1955 (new combination reference)
Fallacia forcipata (Greville) Stickle & Mann, 1990 accepted as Navicula forcipata f. forcipata Greville, 1859 (new combination reference)
Fallacia fracta (Hustedt ex Simonsen) D.G.Mann, 1990 accepted as Navicula fracta Hustedt, 1987 (new combination reference)
Fallacia frustulum (Hustedt) D.G.Mann, 1990 accepted as Navicula frustulum Hustedt, 1945 (new combination reference)
Fallacia gemmifera (R.Simonsen) D.G.Mann, 1990 accepted as Navicula gemmifera R.Simonsen, 1960 (new combination reference)
Fallacia helensis (Schulz) D.G.Mann, 1990 accepted as Navicula helensis Schulz, 1926 (new combination reference)
Fallacia hudsonis (Grunow ex Cleve) Stickle & Mann, 1990 accepted as Navicula hudsonis Grunow, 1891 (new combination reference)
Fallacia hummii (Hustedt) D.G.Mann, 1990 accepted as Navicula hummii Hustedt, 1955 (new combination reference)
Fallacia hyalinula (De Toni) Stickle & Mann, 1990 accepted as Navicula hyalinula De Toni, 1891 (new combination reference)
Fallacia inattingens (R.Simonsen) D.G.Mann, 1990 accepted as Navicula inattingens R.Simonsen, 1959 (new combination reference)
Fallacia indifferens (Hustedt) D.G.Mann, 1990 accepted as Navicula indifferens Hustedt, 1942 (new combination reference)
Fallacia insociabilis (Krasske) D.G.Mann, 1990 accepted as Navicula insociabilis var. insociabilis Krasske, 1932 (new combination reference)
Fallacia litoricola (Hustedt) D.G.Mann, 1990 accepted as Navicula litoricola Hustedt, 1955 (new combination reference)
Fallacia lucens (Hustedt ex Salah) D.G.Mann, 1990 accepted as Navicula lucens Hustedt, 1942 (new combination reference)
Fallacia lucinensis (Hustedt) D.G.Mann, 1990 accepted as Navicula lucinensis Hustedt, 1950 (new combination reference)
Fallacia mitis (Hustedt) D.G.Mann, 1990 accepted as Navicula mitis Hustedt, 1945 (new combination reference)
Fallacia monoculata (Hustedt) D.G.Mann, 1990 accepted as Navicula monoculata Hustedt, 1945 (new combination reference)
Fallacia naumannii (Hustedt) D.G.Mann, 1990 accepted as Navicula naumanni Hustedt, 1942 (new combination reference)
Fallacia nummularia (Greville) D.G.Mann, 1990 accepted as Navicula nummularia Greville, 1859 (new combination reference)
Fallacia ny (Cleve) D.G.Mann, 1990 accepted as Navicula ny Cleve, 1894 (new combination reference)
Fallacia nyella (Hustedt) D.G.Mann, 1990 accepted as Navicula nyella Hustedt, 1964 (new combination reference)
Fallacia oculiformis (Hustedt) D.G.Mann, 1990 accepted as Navicula oculiformis Hustedt, 1955 (new combination reference)
Fallacia omissa (Hustedt) D.G.Mann, 1990 (new combination reference)
Fallacia perlucida (Hustedt) D.G.Mann, 1990 (new combination reference)
Fallacia pseudoforcipata (Hustedt) D.G.Mann, 1990 accepted as Navicula pseudoforcipata Hustedt, 1942 (new combination reference)
Fallacia pseudomuralis (Hustedt) Mann, 1990 (new combination reference)
Fallacia pseudony (Hustedt) D.G.Mann, 1990 accepted as Navicula pseudony Hustedt, 1955 (new combination reference)
Fallacia pseudosemilyrata (R.Simonsen) D.G.Mann, 1990 accepted as Navicula pseudosemilyrata R.Simonsen, 1959 (new combination reference)
Fallacia pygmaea (Kützing) A.J.Stickle & D.G.Mann, 1990 (new combination reference)
Fallacia schaeferae (Hustedt) D.G.Mann, 1990 (new combination reference)
Fallacia semilyrata (R.Simonsen) D.G.Mann, 1990 accepted as Navicula semilyrata R.Simonsen, 1959 (new combination reference)
Fallacia solutepunctata (Hustedt) D.G.Mann, 1990 (new combination reference)
Fallacia standeriella (Archibald) D.G.Mann, 1990 accepted as Navicula standeriella Archibald, 1966 (new combination reference)
Fallacia subforcipata (Hustedt) D.G.Mann, 1990 accepted as Navicula subforcipata Hustedt, 1964 (new combination reference)

 Additional information

 for Navicula muticopsis var. yberai Frenguelli, 1933

Navicula muticopsis Van Heurck was transferred to Luticola muticopsis (Van Heurck) D.G.Mann in Round et al. 1990. ... [details]