Caloneis liber f. tenuistriata (Cleve) M. Peragallo, 1903 accepted as Caloneis liber f. tenuistriata Cleve, 1894 (new combination reference)
Diploneis oculata var. atomus (Rabenhorst) M. Peragallo, 1903 accepted as Navicula oculata var. atomus (Kützing) Rabenhorst (new combination reference)
Navicula acrosphaeria var. undulata (Cleve) M. Peragallo, 1903 accepted as Pinnularia acrosphaeria var. undulata Cleve, 1895 (new combination reference)
Navicula amphisbaena var. liburnica (Grunow) M. Peragallo, 1903 (new combination reference)
Navicula amphisbaena var. vukotinowicii (Pantocsek) M. Peragallo, 1903 (new combination reference)
Navicula australis (Petit) M. Peragallo, 1903 accepted as Stauroneis velata var. australis Petit, 1888 (new combination reference)
Navicula balfouriana (Grunow ms., Cleve) M.Peragallo, 1903 accepted as Pinnularia balfouriana var. balfouriana Grunow ex Cleve, 1895 (new combination reference)
Navicula biceps var. stauroneiformis M. Peragallo, 1903 (original description)
Navicula biconstricta (Grunow) M.Peragallo, 1903 accepted as Navicula trochus var. biconstricta Grunow, 1878 (new combination reference)
Navicula castracanei var. caledonica (Cleve) M. Peragallo, 1903 accepted as Caloneis castracanei var. caledonica Cleve, 1894 (new combination reference)
Navicula castracanei var. philippinorum (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula castracanei var. seychellensis (Grunow Ms. Cleve) M. Peragallo, 1903 accepted as Caloneis castracanei var. seychellensis Grunow ex Cleve, 1894 (new combination reference)
Navicula clavigera (Cleve) M. Peragallo, 1903 accepted as Caloneis clavigera Cleve, 1894 (new combination reference)
Navicula constricta (Cleve) M. Peragallo, 1903 accepted as Pinnularia constricta Cleve, 1895 (new combination reference)
Navicula dactylus var. gracilis (Heribaud) M. Peragallo, 1903 accepted as Navicula gigas var. gracilis Héribaud, 1893 (new combination reference)
Navicula decorata (Brun) M. Peragallo, 1903 accepted as Neidium decoratum var. decoratum Brun, 1901 (new combination reference)
Navicula demerarae Cleve, 1894 accepted as Stauroneis demerarae Cleve, 1894 (new combination reference)
Navicula divergentissima var. subrostrata (A.Cleve) Peragallo, 1903 accepted as Pinnularia divergentissima var. subrostrata A.Cleve, 1895 (new combination reference)
Navicula diversa (Østrup) M.Peragallo, 1903 accepted as Pinnularia diversa Østrup, 1901 (new combination reference)
Navicula dusenii (Cleve) M. Peragallo, 1903 accepted as Caloneis dusenii Cleve, 1894 (new combination reference)
Navicula elliptica var. minor (Rabenhorst) M. Peragallo, 1903 (new combination reference)
Navicula elliptica var. puella (Schumann) M.Peragallo, 1903 accepted as Navicula puella Schumann, 1867 (new combination reference)
Navicula excellens var. excellens (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula excellens var. interrupta (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula exilis var. gomphonemacea (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Navicula gomphonemacea Grunow in Van Heurck, 1880 (new combination reference)
Navicula fasciculata (Grunow ex Cleve) Hustedt, 1961 accepted as Navicula scopulorum var. fasciculata Grunow ex Cleve, 1894 accepted as Climaconeis fasciculata (Grunow ex Cleve) E.J.Cox, 1982 (new combination reference)
Navicula floridana Cleve, 1881 (new combination reference)
Navicula foerarmensis M. Peragallo, 1903 (original description)
Navicula forficula (O'Meara) M. Peragallo, 1903 accepted as Pinnularia forficula O'Meara, 1867 (new combination reference)
Navicula franconiana (Reinsch; Rabenhorst) M. Peragallo, 1903 (new combination reference)
Navicula frater (Cleve) M. Peragallo, 1903 accepted as Caloneis frater Cleve, 1894 (new combination reference)
Navicula gracilis var. acuminata (Brun) M. Peragallo, 1903 accepted as Navicula neglecta var. acuminata Brun, 1880 (new combination reference)
Navicula grevillei var. comoides Peragallo (new combination reference)
Navicula groenlandica (Østrup) M. Peragallo, 1903 accepted as Libellus groenlandica Østrup, 1897 (new combination reference)
Navicula hardmaniana (Cleve) M. Peragallo, 1903 accepted as Caloneis hardmaniana Cleve, 1894 (new combination reference)
Navicula karelia (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula kariana var. curta (Cleve) R.Ross, 1986 (new combination reference)
Navicula kjellmanii var. cuneata (Østrup) M. Peragallo, 1903 accepted as Navicula vegae var. cuneata Østrup, 1895 (new combination reference)
Navicula lacuslemanii var. lacuslemanii (Brun) M. Peragallo, 1903 accepted as Diploneis lacuslemanii Brun, 1895 (new combination reference)
Navicula lagerheimii Cleve, 1894 accepted as Pinnularia lagerheimii var. lagerheimii A. Cleve, 1895 (new combination reference)
Navicula lanceolata var. minuta (Rabenhorst) M. Peragallo, 1903 (new combination reference)
Navicula lignitica (Cleve) M. Peragallo, 1903 accepted as Pinnularia lignitica Cleve, 1895 (new combination reference)
Navicula limosa var. capitata (Lagerstedt) M. Peragallo, 1903 accepted as Navicula gibberula var. capitata Lagerstedt, 1873 (new combination reference)
Navicula lyra f. abnormis (Grunow in Schmidt et al.) M. Peragallo, 1903 accepted as Navicula lyra var. abnormis Grunow in Schmidt et al., 1874 (new combination reference)
Navicula major f. conjugata (Turpin) M. Peragallo, 1903 accepted as Navicula conjugata Turpin, 1828 (new combination reference)
Navicula major f. linearis (Cleve) M. Peragallo, 1903 accepted as Pinnularia major f. linearis (Cleve) Dippel, 1905 (new combination reference)
Navicula major var. asymetrica (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula major var. crassa (Rabenhorst; Rabenhorst) M. Peragallo, 1903 accepted as Pinnularia major var. crassa Rabenhorst, 1864 (new combination reference)
Navicula mesogongyla var. interrupta (Cleve) M. Peragallo, 1903 accepted as Pinnularia mesogongyla var. interrupta Cleve, 1891 (new combination reference)
Navicula mesolepta var. tenuis (A. Cleve) M. Peragallo, 1903 accepted as Pinnularia mesolepta f. tenuis A. Cleve, 1895 (new combination reference)
Navicula musca var. eurynota (Cleve) M. Peragallo, 1903 accepted as Caloneis musca var. eurynota Cleve, 1894 (new combination reference)
Navicula musca var. marginopunctata (Grove & Sturt) M. Peragallo, 1903 accepted as Navicula marginopunctata Grove & Sturt, 1887 (new combination reference)
Navicula nodosa var. capitata (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula nodosa var. curta (Rabenhorst) M. Peragallo, 1903 (new combination reference)
Navicula oblonga var. macilenta (Ehrenberg) Peragallo, 1903 accepted as Navicula macilenta Ehrenberg, 1837 † (new combination reference)
Navicula oregonica var. oregonica (Cleve) M. Peragallo, 1903 accepted as Pinnularia oregonica Cleve, 1895 (new combination reference)
Navicula parallela (Brun) M.Peragallo, 1903 † accepted as Pinnularia parallela var. parallela Brun, 1895 (new combination reference)
Navicula pinnularia var. fluminensis (Grunow) M. Peragallo, 1903 accepted as Navicula fluminensis var. fluminensis Grunow, 1860 (new combination reference)
Navicula pinnularia var. kerguelensis (Cleve & Grunow) M. Peragallo, 1903 accepted as Navicula fluminensis var. kerguelensis Grunow (new combination reference)
Navicula producta var. polygibba (Brun) M. Peragallo, 1903 accepted as Neidium productum var. polygibba Brun, 1901 (new combination reference)
Navicula rectangulata var. lumen (H. Peragallo) M. Peragallo, 1903 accepted as Navicula lumen H. Peragallo, 1888 (new combination reference)
Navicula rectangulata var. stauntonii (Grunow in Cleve & Möller) M. Peragallo, 1903 accepted as Alloioneis stauntonii Grunow, 1882 (new combination reference)
Navicula rectangulata var. subundulata (Cleve) M. Peragallo, 1903 (new combination reference)
Navicula reichardtii var. tschuktschorum (Cleve; Cleve) M. Peragallo, 1903 accepted as Navicula tschuktschorum Cleve, 1883 (new combination reference)
Navicula schliephackeana (Grunow in litt., Rabenhorst) M. Peragallo, 1903 accepted as Nitzschia schliephackeana Grunow ex Rabenhorst, 1864 (new combination reference)
Navicula spectabilis var. moelleriana (Janisch in Schmidt et al.) M. Peragallo, 1903 accepted as Navicula bullata var. moelleriana Janisch in Schmidt et al., 1881 (new combination reference)
Navicula sphaerophora var. peragalli (Brun & Heribaud in Heribaud) M. Peragallo, 1903 accepted as Navicula serians var. peragalli Brun & Héribaud in Héribaud, 1893 (new combination reference)
Navicula stauroptera var. capitata (A. Cleve) M. Peragallo, 1903 accepted as Pinnularia stauroptera var. capitata A. Cleve, 1895 (new combination reference)
Navicula stauroptera var. sancta (Grunow Ms. in Cleve) M. Peragallo, 1903 accepted as Pinnularia stauroptera f. sancta Grunow ex Cleve, 1895 (new combination reference)
Navicula transitans f. gracilenta (Grunow) Cleve, 1883 accepted as Navicula derasa var. gracilenta Grunow in Cleve & Grunow, 1880 (new combination reference)
Navicula trigonocephala (Cleve) M.Peragallo, 1903 accepted as Pinnularia trigonocephala f. trigonocephala Cleve, 1895 (new combination reference)
Navicula upsaliensis (Grunow) Peragallo, 1903 accepted as Navicula menisculus var. upsaliensis Grunow, 1880 (new combination reference)
Navicula viridis var. acuminata (W.Smith) M.Peragallo, 1903 accepted as Pinnularia acuminata var. acuminata W. Smith, 1853 (new combination reference)
Nitzschia baltica (Juhlin-Dannfelt) M. Peragallo, 1903 accepted as Homoeocladia baltica Juhlin-Dannfelt, 1882 (new combination reference)
Nitzschia biceps (Schumann) M. Peragallo, 1903 accepted as Homoeocladia biceps Schumann, 1867 (new combination reference)
Nitzschia capitata Østrup, 1913 accepted as Homoeocladia capitata H.L. Smith, 1874 (new combination reference)
Nitzschia conferta (Richter) M. Peragallo, 1903 accepted as Homoeocladia conferta Richter, 1879 (new combination reference)
Nitzschia consimilis (Grunow) M. Peragallo, 1903 accepted as Nitzschia sigma var. consimilis Grunow, 1878 (new combination reference)
Nitzschia germanica (Richter) M. Peragallo, 1903 accepted as Homoeocladia germanica Richter, 1879 (new combination reference)
Nitzschia groveana var. cavernosa (Brun) M. Peragallo, 1903 accepted as Nitzschia antiqua var. cavernosa Brun, 1893 (new combination reference)
Nitzschia incerta (Grunow) M.Peragallo, 1903 accepted as Nitzschia lorenziana var. incerta Grunow in Cleve & Grunow, 1880 (new combination reference)
Nitzschia incurva var. densistriata (Peragallo & Peragallo) M. Peragallo, 1903 (new combination reference)
Nitzschia lanceolata var. dubia (Grunow) M. Peragallo, 1903 accepted as Nitzschia incrustans var. dubia Grunow, 1862 (new combination reference)
Nitzschia lubrica (Meneghini manuscript) M. Peragallo, 1903 accepted as Schizonema lubricum Meneghini ex Kutzing, 1844 (new combination reference)
Nitzschia neptuni (Schumann) M. Peragallo, 1903 accepted as Tryblionella neptunii Schumann, 1867 (new combination reference)
Nitzschia notata (Kützing) Rabenhorst ex M. Peragallo, 1903 accepted as Synedra notata Kützing, 1844 (new combination reference)
Nitzschia palea var. famelica (Kützing) M.Peragallo, 1903 accepted as Synedra famelica var. famelica Kützing, 1844 (new combination reference)
Nitzschia palea var. romana (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Nitzschia romana var. romana Grunow in Van Heurck, 1881 (new combination reference)
Nitzschia pantocsekii M. Peragallo, 1903 (original description)
Nitzschia perminuta f. perminuta (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Nitzschia frustulum f. perminuta Grunow in Van Heurck, 1881 (new combination reference)
Nitzschia socialis var. indica (Castracane) M. Peragallo, 1903 accepted as Bacillaria socialis var. indica Castracane, 1886 (new combination reference)
Odontella acutum (Ehrenberg) M. Peragallo, 1903 accepted as Triceratium acutum Ehrenberg, 1844 (1845) (new combination reference)
Odontella affine (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Triceratium affine Grunow in Van Heurck, 1883 (new combination reference)
Odontella antediluviana (Ehrenberg) M. Peragallo, 1903 accepted as Amphitetras antediluviana var. antediluviana Ehrenberg, 1840 (new combination reference)
Odontella californica (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Triceratium californicum Grunow in Van Heurck, 1883 (new combination reference)
Odontella consimilis (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Triceratium consimile Grunow in Van Heurck, 1883 (new combination reference)
Odontella cornuta (Greville) M. Peragallo, 1903 accepted as Triceratium cornutum R.K.Greville † accepted as Trinacria cornuta (R.K.Greville) P.A.Sims & R.Ross, 1988 † (new combination reference)
Odontella elegans (Greville) M. Peragallo, 1903 accepted as Amphitetras elegans Greville, 1866 (new combination reference)
Odontella favus (Ehrenberg) M. Peragallo, 1903 accepted as Triceratium favus f. favus Ehrenberg, 1840 (new combination reference)
Odontella laeve var. annulifera (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Triceratium laeve var. annulifera Grunow in Van Heurck, 1883 (new combination reference)