Cavinula pseudoscutiformis (Hustedt) D.G.Mann & A.J.Stickle, 1990 accepted as
Navicula pseudoscutiformis Hustedt, 1930 (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 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)
Encyonema elginense (Krammer) D.G.Mann, 1990 (new combination reference)
Luticola D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (original description)
Luticola cohnii (Hilse) D.G.Mann, 1990 accepted as
Stauroneis cohnii Hilse, 1860 (new combination reference)
Luticola gaussii (Heiden) D.G.Mann, 1990 (new combination reference)
Luticola goeppertiana (Bleisch) D.G.Mann, 1990 (new combination reference)
Luticola murrayi (West & G.S.West) D.G.Mann, 1990 accepted as
Navicula murrayi var. murrayi W. & G.S. West, 1911 (new combination reference)
Luticola mutica (Kützing) D.G.Mann, 1990 accepted as
Navicula mutica f. mutica Kützing, 1844 (new combination reference)
Luticola muticopsis (Van Heurck) D.G.Mann, 1990 (new combination reference)
Luticola palaearctica (Hustedt) D.G.Mann, 1990 (new combination reference)
Luticola paramutica (Bock) D.G.Mann, 1990 accepted as
Navicula paramutica var. paramutica Bock, 1963 (new combination reference)
Luticola undulata (Hilse) D.G.Mann, 1990 accepted as
Stauroneis undulata Hilse, 1860 (new combination reference)
Luticola ventricosa (Kützing) D.G.Mann, 1990 accepted as
Stauroneis ventricosa var. ventricosa Kützing, 1844 (new combination reference)
Martyana martyi (Héribaud-Joseph) Round, 1990 accepted as
Opephora martyi f. martyi Héribaud, 1902 (new combination reference)
Petroneis humerosa (Brébisson ex W.Smith) A.J.Stickle & D.G.Mann, 1990 accepted as
Navicula humerosa f. humerosa Brébisson ex W. Smith, 1856 (new combination reference)
Proschkinia complanatoides (Hustedt ex Simonsen) D.G.Mann, 1990 accepted as
Navicula complanatoides Hustedt, 1987 (new combination reference)
Psammodictyon D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (original description)
Psammodictyon constrictum (Gregory) D.G.Mann, 1990 accepted as
Tryblionella constricta Gregory, 1855 (new combination reference)
Tryblionella littoralis (Grunow) D.G.Mann, 1990 accepted as
Nitzschia littoralis var. littoralis Grunow in Cleve & Grunow, 1880 (new combination reference)
Tryblionella marginulata (Grunow) D.G.Mann, 1990 accepted as
Nitzschia marginulata f. marginulata Grunow in Cleve & Möller, 1878 (new combination reference)