Caloneis alpestris f. cuneata Mayer, 1941 (original description)
Caloneis alpestris f. inflata Mayer, 1941 (original description)
Caloneis alpestris f. interrupta Mayer, 1941 (original description)
Caloneis alpestris f. typica Mayer, 1941 (original description)
Caloneis alpestris var. lancettula Mayer, 1941 (original description)
Caloneis alpestris var. linearis Mayer, 1941 (original description)
Caloneis alpestris var. subundulata Mayer, 1941 (original description)
Caloneis amphisbaena var. genuina Mayer, 1941 (original description)
Caloneis bacillariaeformis Mayer, 1941 (original description)
Caloneis bacillum var. angusta Mayer, 1941 (original description)
Caloneis bacillum var. constricta Mayer, 1941 (original description)
Caloneis bacillum var. fasciata (Cleve) Mayer, 1939 accepted as Navicula fasciata var. fasciata Lagerstedt, 1873 (new combination reference)
Caloneis bacillum var. genuina Mayer, 1941 (original description)
Caloneis bacillum var. subcuneata Mayer, 1941 (original description)
Caloneis bacillum var. subundulata Mayer, 1941 (original description)
Caloneis latiuscula f. oblonga (Meister) Mayer, 1941 accepted as Caloneis latiuscula var. oblonga Meister, 1912 (new combination reference)
Caloneis latiuscula var. formosaeformis Mayer, 1941 (original description)
Caloneis latiuscula var. genuina Mayer, 1941 (original description)
Caloneis silicula f. angusta Mayer, 1913 (new combination reference)
Caloneis silicula f. angusta Mayer, 1913 (original description)
Caloneis silicula f. angustior Mayer, 1941 (original description)
Caloneis silicula f. genuina (Cleve) Mayer, 1941 accepted as Caloneis silicula var. genuina Cleve, 1894 (new combination reference)
Caloneis silicula f. genuina Mayer, 1941 (original description)
Caloneis silicula f. semicruciata Mayer, 1941 (original description)
Caloneis silicula f. typica Mayer, 1941 (original description)
Caloneis silicula var. alpina (Cleve) Mayer, 1941 accepted as Caloneis silicula var. alpina Cleve, 1894 (new combination reference)
Caloneis silicula var. bicuneata (Grunow) Mayer, 1941 accepted as Navicula limosa var. bicuneata Grunow, 1860 (new combination reference)
Caloneis silicula var. curta (Grunow in Van Heurck) Mayer, 1941 accepted as Navicula limosa var. curta Grunow in Van Heurck, 1880 (new combination reference)
Caloneis silicula var. inflatiformis Mayer, 1941 (original description)
Caloneis silicula var. minuta (Grunow) Mayer, 1941 accepted as Navicula ventricosa var. minuta Cleve & Möller, 1879 (new combination reference)
Caloneis silicula var. oblonga Mayer, 1941 (original description)
Caloneis silicula var. peisonis (Grunow) Mayer, 1941 accepted as Navicula peisonis var. peisonis Grunow, 1860 (new combination reference)
Caloneis silicula var. rhomboidalis (Mayer) Mayer, 1941 accepted as Caloneis silicula f. rhomboidalis Mayer, 1913 (new combination reference)
Caloneis silicula var. subundulata (Grunow) Mayer, 1917 accepted as Navicula ventricosa var. subundulata Grunow, 1880 (new combination reference)
Caloneis silicula var. tenuis (Hustedt) Mayer, 1941 accepted as Caloneis silicula var. tenuis Hustedt, 1915 (new combination reference)
Caloneis silicula var. truncata (Grunow) Meister accepted as Navicula truncata Kützing, 1844 (new combination reference)
Caloneis silicula var. tumida Hustedt accepted as Caloneis silicula f. tumida Hustedt, 1909 (new combination reference)
Caloneis silicula var. tumidiformis Mayer, 1941 (original description)
Caloneis silicula var. tumidula Mayer, 1941 (original description)
Caloneis silicula var. undulata (Grunow) Mayer, 1941 accepted as Navicula limosa var. undulata Grunow, 1880 (new combination reference)
Caloneis silicula var. undulatiformis Mayer, 1941 (original description)
Caloneis trochus (Schumann) Mayer, 1941 accepted as Navicula trochus var. trochus Schumann, 1863 (new combination reference)
Caloneis trochus f. fasciata (Hustedt) Mayer, 1941 accepted as Caloneis schumanniana var. fasciata Hustedt, 1922 (new combination reference)
Caloneis trochus f. interrupta Mayer, 1941 (original description)
Caloneis trochus f. linearis (Hustedt) Mayer, 1941 accepted as Caloneis schumanniana var. linearis Hustedt, 1911 (new combination reference)
Caloneis trochus f. rhomboidalis Mayer, 1941 (original description)
Caloneis trochus f. trochus (Schumann) Mayer, 1941 (new combination reference)
Caloneis trochus var. biconstricta (Grunow) Mayer, 1941 accepted as Navicula trochus var. biconstricta Grunow, 1878 (new combination reference)
Caloneis trochus var. genuina Mayer, 1941 (original description)
Caloneis trochus var. gracilis Mayer, 1941 (original description)
Caloneis trochus var. lancettula (Hustedt) Mayer, 1941 accepted as Caloneis schumanniana var. lancettula Hustedt, 1930 (new combination reference)
Caloneis trochus var. pulchraeformis Mayer, 1941 (original description)