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)
Lyrella approximata (Greville) D.G.Mann, 1990 accepted as Navicula approximata f. approximata Greville, 1859 (new combination reference)
Lyrella clavata (Gregory) D.G.Mann, 1990 (new combination reference)
Lyrella hennedyi (W.Smith) Stickle & D.G.Mann, 1990 accepted as Navicula hennedyii f. hennedyii W. Smith, 1856 (new combination reference)
Lyrella irrorata (Greville) D.G.Mann, 1990 accepted as Navicula irrorata f. irrorata Greville, 1859 (new combination reference)
Petrodictyon D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (original description)
Petrodictyon gemma (Ehrenberg) D.G.Mann, 1990 accepted as Surirella gemma f. gemma Ehrenberg, 1840 (new combination reference)
Petroneis granulata (Bailey) D.G.Mann, 1990 accepted as Navicula granulata Bailey, 1854 (new combination reference)
Petroneis marina (Ralfs) D.G.Mann, 1990 accepted as Navicula marina var. marina Ralfs in Pritchard, 1861 (new combination reference)
Petroneis monilifera (Cleve) A.J.Stickle & D.G.Mann, 1990 accepted as Navicula monilifera f. monilifera Cleve, 1895 (new combination reference)
Scolioneis D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 accepted as Navicula J.B.M. Bory de Saint-Vincent, 1822 (original description)
Scolioneis tumida (Brébisson ex Kützing) D.G.Mann, 1990 accepted as Navicula tumida var. tumida Brébisson in Kützing, 1849 (new combination reference)
Tryblionella granulata (Grunow) D.G.Mann, 1990 accepted as Nitzschia granulata f. granulata Grunow in Cleve & Möller, 1879 (new combination reference)
Urosolenia eriensis (H.L.Smith) Round & R.M.Crawford, 1990 accepted as Rhizosolenia eriensis f. eriensis H.L. Smith, 1872 (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]