Actinoptychus senarius var. barbadensis (A. Schmidt) Desikachary & Sreelatha, 1989 accepted as Actinoptychus undulatus var. barbadensis Schmidt in Schmidt et al., 1874 (new combination reference)
Asterolampra wisei Desikachary & Sreelatha, 1989 (original description)
Aulacodiscus amoenus var. sparsipunctata Desikachary & Sreelatha, 1989 (original description)
Cocconeis cyclophora var. schraderi Desikachary & Sreelatha, 1989 (original description)
Cocconeis reedii Desikachary & Sreelatha, 1989 (original description)
Coscinodiscus jacksonii Desikachary & Sreelatha, 1989 (original description)
Diploneis aestica var. oamaruensis (Cleve) Desikachary & Sreelatha, 1989 accepted as Diploneis fusca var. oamaruensis Cleve, 1894 (new combination reference)
Drepanotheca bivittata var. elongata (Brun) Desikachary & Sreelatha, 1989 accepted as Eunotogramma bivittata var. elongata Brun, 1894 (new combination reference)
Eunotia grovei Desikachary & Sreelatha, 1989 (original description)
Hercotheca oamaruensis Desikachary & Sreelatha, 1989 (original description)
Hyalodiscus dubiosus var. curvans (Rattray) Desikachary & Sreelatha, 1989 accepted as Coscinodiscus dubiosus var. curvans Rattray, 1890 (new combination reference)
Hyalodiscus franklinii var. robusta (Grove & Sturt) Desikachary & Sreelatha, 1989 accepted as Hyalodiscus subtilis var. robusta Grove & Sturt, 1887 (new combination reference)
Hyalodiscus radiatus var. striata Desikachary & Sreelatha, 1989 (original description)
Hyalodiscus rossii Desikachary & Sreelatha, 1989 (original description)
Leudugeria janischii var. crenulata Desikachary & Sreelatha, 1989 (original description)
Mastogloia lamprosticta (Gregory) Desikachary & Sreelatha, 1989 accepted as Cocconeis lamprosticta Gregory, 1857 (new combination reference)
Mastogloia schraderii Desikachary & Sreelatha, 1989 (original description)
Navicula inexacta var. symmetrica (Cleve) Desikachary & Sreelatha, 1989 (new combination reference)
Neohuttonia reedii (Bone & Gosden) Desikachary & Sreelatha, 1989 accepted as Huttonia reedii Bone & Gosden, 1967 (new combination reference)
Neohuttonia reversa (Grove & Sturt) Desikachary & Sreelatha, 1989 accepted as Biddulphia reversa Grove & Sturt, 1887 (new combination reference)
Neohuttonia tripartita (Barker & Meakin) Desikachary & Sreelatha, 1989 accepted as Huttonia tripartita Barker & Meakin, 1946 (new combination reference)
Nitzschia bilobata var. oamaruensis Desikachary & Sreelatha, 1989 (original description)
Plagiogramma schraderii Desikachary & Sreelatha, 1989 (original description)
Rattrayella simbirskianus (Grunow in A. Schmidt) Desikachary & Sreelatha, 1989 accepted as Glyphodiscus simbirskianus (Grunow) Grunow, 1888 (new combination reference)
Rhaphoneis nodulifer f. major Desikachary & Sreelatha, 1989 (original description)
Stephanopyxis monstrosa (Forti) Desikachary & Sreelatha, 1989 (new combination reference)
Stictodiscus californicus f. triangularis Desikachary & Sreelatha, 1989 (original description)
Stictodiscus haitianus var. major Desikachary & Sreelatha, 1989 (original description)
Stictodiscus parallelus f. pentagona Desikachary & Sreelatha, 1989 (original description)
Triceratium barkerii Desikachary & Sreelatha, 1989 (original description)
Trigonium arcticum var. japonica (Grunow in Schmidt) Desikachary & Sreelatha, 1989 accepted as Triceratium arcticum var. japonica Grunow in Schmidt et al., 1882 (new combination reference)
Trigonium arcticum var. pentagonalis (Tempère & Peragallo) Desikachary & Sreelatha, 1989 accepted as Triceratium arcticum var. pentagonalis Tempère & Peragallo, 1910 (new combination reference)
Trigonium arcticum var. quadrata (Grunow ex Tempère & Peragallo) Desikachary & Sreelatha, 1989 (new combination reference)
Trigonium formosum f. quadrangularis (Greville) Desikachary & Sreelatha, 1989 accepted as Triceratium quadrangulare Greville, 1865 (new combination reference)
Trigonium gallapagense (Cleve) Desikachary & Sreelatha, 1989 accepted as Triceratium gallapagense Cleve, 1881 (new combination reference)
Trigonium inelegans var. micropora (Grunow in Van Heurck) Desikachary & Sreelatha, 1989 accepted as Triceratium inelegans var. micropora Grunow in A. Schmidt, 1888 (new combination reference)
Trigonium inelegans var. tubulosa (Brun) Desikachary & Sreelatha, 1989 accepted as Triceratium inelegans var. tubulosa Brun, 1896 (new combination reference)
Trigonium lineatum (Greville) Desikachary & Sreelatha, 1989 accepted as Triceratium lineatum f. lineatum Greville, 1863 (new combination reference)
Trigonium lineatum f. biangulata (Laporte & Lefebure) Desikachary & Sreelatha, 1989 (new combination reference)