Achnanthes polynesica H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Achnanthidium pfisteri H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Biremis motschii (Meister) H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 accepted as
Navicula motschii Meister, 1912 (new combination reference)
Brachysira calcicola Lange-Bertalot, 1994 (original description)
Brachysira neglectissima Lange-Bertalot, 2004 (original description)
Brachysira sinaiensis H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Cavinula pusio (Cleve) Lange-Bertalot, 2004 accepted as
Navicula pusio f. pusio Cleve, 1895 (new combination reference)
Chamaepinnularia amphiborealis Lange-Bertalot & M.Werum, 2004 (original description)
Chamaepinnularia falkiae Lange-Bertalot & M.Werum, 2004 (original description)
Chamaepinnularia submuscicola (Krasske) H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 accepted as
Navicula submuscicola Krasske, 1939 (new combination reference)
Cocconeis euglyptoides (Geitler) H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 accepted as
Cocconeis placentula var. euglyptoides L.Geitler, 1958 (new combination reference)
Cocconeis pseudolineata (Geitler) Lange-Bertalot, 2004 accepted as
Cocconeis placentula var. pseudolineata Geitler, 1927 (new combination reference)
Cosmioneis incognita (Krasske) H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 accepted as
Navicula incognita Krasske, 1932 (new combination reference)
Diadesmis arcuatoides Lange-Bertalot, 2004 accepted as
Humidophila arcuatoides (Lange-Bertalot) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014 (original description)
Diadesmis pyrenaica Lange-Bertalot & Werum, 2004 (original description)
Diploneis fontanella Lange-Bertalot, 2004 (original description)
Diploneis separanda Lange-Bertalot, 2004 (original description)
Encyonopsis petri H. Lange-Bertalot & K. Krammer in Werum & Lange-Bertalot, 2004 (original description)
Eolimna silvahercynia (Lange-Bertalot) Lange-Bertalot, 2004 accepted as
Navicula silvahercynia Lange-Bertalot in Lange-Bertalot & Krammer, 1989 (new combination reference)
Eolimna tantula (Hustedt) Lange-Bertalot, 2004 accepted as
Navicula tantula Hustedt, 1943 (new combination reference)
Eunotia arcofallax H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Eunotia braendlei H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Eunotia cavernosa H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Eunotia fennica (Hustedt) Lange-Bertalot, 2004 accepted as
Eunotia denticulata var. fennica Hustedt, 1932 (new combination reference)
Eunotia kruegeri H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Eunotia neoborealis H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Eunotia palatina H. Lange-Bertalot & W. Krüger in Werum & Lange-Bertalot, 2004 (original description)
Eunotia pexii H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Fallacia crassicostata H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Fallacia enigmata (Germain) H. Lange-Bertalot & Werum in Werum & Lange-Bertalot, 2004 accepted as
Navicula enigmatica Germain, 1980 (new combination reference)
Fallacia lenzii (Hustedt) Lange-Bertalot, 2004 accepted as
Navicula lenzii Hustedt, 1936 (new combination reference)
Gomphonema acidoclinatum Lange-Bertalot & Reichardt, 2004 (original description)
Gomphonema olivaceolacuum (Lange-Bertalot & Reichardt) Lange-Bertalot & Reichardt, 2004 accepted as
Gomphonema olivaceum var. olivaceolacuum Lange-Bertalot & Reichardt, 1993 (new combination reference)
Gomphonema subaerophilum H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Gomphosphenia fontinalis H. Lange-Bertalot, L. Ector & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Hantzschia calcifuga Reichardt & Lange-Bertalot, 2004 (original description)
Navicula oetzvallensis H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 (original description)
Naviculadicta jurafontinalis H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Naviculadicta schaumburgii H. Lange-Bertalot & G. Hofmann in Werum & Lange-Bertalot, 2004 (original description)
Naviculadicta schmassmannii Hustedt accepted as
Navicula schmassmanni Hustedt, 1943 accepted as
Humidophila schmassmannii (Hustedt, 1943) Buczkó & Wojtal, 2015 (new combination reference)
Pinnularia frauenbergiana var. caloneiopsis Lange-Bertalot & M.Werum, 2004 (original description)
Pinnularia palatina H. Lange-Bertalot & W. Krüger in Werum & Lange-Bertalot, 2004 (original description)
Planothidium reichardtii H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Pulchella obsita (Hustedt) H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 accepted as
Navicula obsita Hustedt, 1945 accepted as
Pulchellophycus obsitus (Hustedt) Edlund & M.J.Wynne, 2019 (new combination reference)
Sellaphora hustedtii (Krasske) Lange-Bertalot & Werum, 2004 accepted as
Navicula hustedtii f. hustedtii Krasske, 1923 (new combination reference)
Stauroneis acidoclinata Lange-Bertalot & Werum, 2004 (original description)
Stauroneis angustilancea Metzeltin & Lange-Bertalot, 1998 (original description)
Stauroneis fridericiana Lange-Bertalot, 2004 (original description)
Stauroneis pseudoagrestis H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Stauroneis separanda Lange-Bertalot & Werum, 2004 (original description)
Stauroneis silvahassiaca H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)
Surirella margilacola H. Lange-Bertalot & M. Werum in Werum & Lange-Bertalot, 2004 (original description)