Achnanthes capensis var. capensis Kützing, 1844 (original description)
Achnanthes capensis var. multiarticulata Kützing, 1844 (original description)
Achnanthes genuflexa Kützing, 1844 (original description)
Achnanthes macropus Kützing in lit. in Kützing, 1844 (original description)
Achnanthes parvula Kützing, 1844 (original description)
Achnanthes salina (Kützing) Kützing, 1844 accepted as Fragilaria salina Kützing, 1833 (new combination reference)
Achnanthes striata Suhr ms., Kützing, 1844 (original description)
Achnanthes subsessilis var. multiarticulata Kützing, 1844 (original description)
Achnanthes ventricosa Kützing, 1844 (original description)
Achnanthidium F.T. Kützing, 1844 (original description)
Achnanthidium delicatulum f. delicatulum Kützing, 1844 (original description)
Achnanthidium microcephalum Kützing, 1844 (original description)
Actinocyclus undulatus Kützing, 1844 (original description)
Actinoptychus duodenarius Ehrenberg accepted as Actinocyclus duodenarius (Ehrenberg) W. Smith, 1856 (new combination reference)
Actinoptychus octodenarius Ehrenberg, 1854 accepted as Actinocyclus octodenarius Ehrenberg, 1839 (new combination reference)
Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (new combination reference)
Actinoptychus sedenarius Ehrenberg accepted as Actinocyclus sedenarius Ehrenberg, 1839 (new combination reference)
Actinoptychus ternarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus ternarius Ehrenberg, 1839 (new combination reference)
Amphipleura F.T. Kützing, 1844 (original description)
Amphipleura danica var. danica Kützing, 1844 (original description)
Amphipleura pellucida var. pellucida (Kützing) Kützing, 1844 accepted as Frustulia pellucida Kützing, 1833 (new combination reference)
Amphipleura rigida Kützing, 1844 (original description)
Amphiprora alata f. alata (Ehrenberg) Kützing, 1844 accepted as Navicula alata Ehrenberg, 1840 accepted as Entomoneis alata (Ehrenberg) Ehrenberg, 1845 (new combination reference)
Amphora C.G. Ehrenberg ex F.T. Kützing, 1844 (original description)
Amphora acutiuscula var. acutiuscula Kützing, 1844 (original description)
Amphora affinis f. affinis Kützing, 1844 (original description)
Amphora aponina f. aponina Kützing, 1844 (original description)
Amphora atomus Kützing, 1844 (original description)
Amphora borealis Kützing, 1844 (original description)
Amphora coffeaeformis (C.Agardh) Kützing, 1844 accepted as Halamphora coffeiformis (C.Agardh) Levkov, 2009 (new combination reference)
Amphora coffeaeformis f. coffeaeformis (Agardh) Kützing, 1844 accepted as Frustulia coffeaeformis C.Agardh, 1827 (new combination reference)
Amphora coffeaeformis var. fischeri Kützing, 1844 (original description)
Amphora corinata Kützing, 1844 (original description)
Amphora elliptica (Agardh) Kützing, 1844 accepted as Frustulia elliptica C.Agardh, 1824 (new combination reference)
Amphora fischeri (Kützing) Kützing accepted as Amphora coffeaeformis var. fischeri Kützing, 1844 (original description)
Amphora hyalina var. hyalina Kützing, 1844 (original description)
Amphora lineolata ‘Ehrenberg' [sensu] Kützing, 1844 (taxonomy source)
Amphora ovalis f. ovalis (Kützing) Kützing, 1844 accepted as Frustulia ovalis Kützing, 1833 (new combination reference)
Amphora ovalis var. minor Kützing, 1844 (original description)
Amphora veneta f. veneta Kützing, 1844 (original description)
Berkeleya adriatica Kützing, 1844 (original description)
Biddulphia quinquelocularis Kützing, 1844 (original description)
Biddulphia septemlocularis Kützing, 1844 (original description)
Biddulphia trilocularis Kützing, 1844 (original description)
Campylodiscus C.G. Ehrenberg ex F.T. Kützing, 1844 (original description)
Campylodiscus clypeus var. clypeus (Ehrenberg) Kützing, 1844 accepted as Cocconeis clypeus Ehrenberg, 1838 (new combination reference)
Campylodiscus echeneis f. echeneis Ehrenberg ex Kützing, 1844 (original description)
Campylodiscus noricus var. noricus Ehrenberg ex Kützing, 1844 (original description)
Campylodiscus radiosus Ehrenberg ex Kützing, 1844 (original description)
Campylodiscus remora Ehrenberg ex Kützing, 1844 (original description)
Campylodiscus striatus Ehrenberg ex Kützing, 1844 (original description)
Ceratoneis arcus f. arcus (Ehrenberg) Kützing, 1844 accepted as Navicula arcus Ehrenberg, 1836 (new combination reference)
Ceratoneis spiralis Kützing, 1844 (original description)
Climacosphenia australis Kützing, 1844 (original description)
Cocconeis adriatica Kützing, 1844 (original description)
Cocconeis aggregata Kützing, 1844 (original description)
Cocconeis consociata Kützing, 1844 (original description)
Cocconeis depressa Kützing, 1844 (original description)
Cocconeis marginata Kützing, 1844 (original description)
Cocconeis mediterranea Kützing, 1844 (original description)
Cocconeis molesta f. molesta Kützing, 1844 (original description)
Cocconeis nidulans Kützing accepted as Frustulia nidulans Brébisson (new combination reference)
Cocconeis nigricans var. denudata Kützing, 1844 (original description)
Cocconeis nigricans var. nigricans Kützing, 1844 (original description)
Cocconeis oblonga Kützing, 1844 (original description)
Cocconeis pediculus var. minor Kützing, 1844 (original description)
Cocconeis pediculus var. salina Kützing, 1844 (original description)
Cocconeis peruviana Kützing, 1844 (original description)
Cocconeis pinnularia Kützing, 1844 (original description)
Cocconeis pumila Kützing, 1844 (original description)
Cocconeis pygmaea Kützing, 1844 (original description)
Cocconema gibbum var. sessile Kützing, 1844 (original description)
Coscinodiscus cinctus Kützing, 1844 (original description)
Coscinodiscus cruciatus (Ehrenberg) Kützing, 1844 accepted as Pyxidicula cruciata Ehrenberg, 1838 (new combination reference)
Coscinodiscus graecus Kützing accepted as Discoplea graeca Ehrenberg, 1840 accepted as Lindavia graeca (Ehrenberg) Nakov et al., 2015 (new combination reference)
Coscinodiscus marginatus Kützing, 1844 (original description)
Coscinodiscus minutus Kützing, 1844 (original description)
Coscinodiscus patina [sensu?] Kützing, 1844 (taxonomy source)
Coscinodiscus radiolatus Kützing, 1844 (original description)
Coscinodiscus striatus Kützing, 1844 (original description)
Cyclotella ligustica Kützing, 1844 (original description)
Cyclotella maxima Kützing, 1844 (original description)
Cyclotella meneghiniana f. meneghiniana Kützing, 1844 (original description)
Cyclotella minutula Kützing, 1844 † (original description)
Cyclotella rotula Kützing, 1844 accepted as Discoplea rotula Ehrenberg, 1844 (original description)
Cyclotella scotica Kützing, 1844 (original description)
Cymbella affinis f. affinis Kützing, 1844 (original description)
Cymbella cuspidata Kützing, 1844 † (original description)
Cymbella ehrenbergii Kützing, 1844 † (original description)
Cymbella excisa Kützing, 1844 (original description)
Cymbella flexella Kützing, 1844 (original description)
Cymbella gastroides (Kützing) Kützing, 1844 accepted as Frustulia gastroides Kützing, 1833 (new combination reference)
Cymbella gastroides var. beta Kützing, 1844 (original description)
Cymbella gracilis (Ehrenberg) Kützing, 1844 accepted as Cocconema gracile Ehrenberg, 1841 (new combination reference)
Cymbella helvetica Kützing, 1844 (original description)
Cymbella heteropleura (Ehrenberg) Kützing, 1844 accepted as Pinnularia heteropleura Ehrenberg, 1840 (new combination reference)
Cymbella leptoceros (Ehrenberg) Kützing, 1844 accepted as Cocconema leptoceros Ehrenberg, 1843 (new combination reference)
Cymbella maculata (Kützing) Brébisson & Godey, 1835 accepted as Frustulia maculata Kützing, 1833 (new combination reference)
Cymbella maculata f. maculata Kützing, 1844 (original description)
Cymbella obtusiuscula Kützing, 1844 (original description)