Cosmioneis brasiliana (Cleve) C.E. Wetzel & Ector, 2017
Cosmioneis capitata (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005 accepted as Navicula incognita var. capitata Hustedt, 1937
Cosmioneis citriformis R.L.Lowe & A.R.Sherwood, 2010 (uncertain > unassessed )
Cosmioneis delawarensis (Grunow ex Cleve) D.G.Mann, 1990 accepted as Navicula delawarensis Grunow ex Cleve, 1893
Cosmioneis eta (Cleve) Witkowski accepted as Navicula eta Cleve, 1893
Cosmioneis grossepunctata (Hustedt) D.G.Mann, 1990 accepted as Navicula grossepunctata Hustedt, 1944
Cosmioneis hawaiiensis R.L.Lowe & A.R.Sherwood, 2010 (uncertain > unassessed )
Cosmioneis incognita (Krasske) H. Lange-Bertalot in Werum & Lange-Bertalot, 2004 accepted as Navicula incognita Krasske, 1932
Cosmioneis lundstroemii (Cleve) D.G.Mann, 1990 accepted as Navicula lundstroemii var. lundstroemii Cleve in Cleve & Grunow, 1880
Cosmioneis platensis (Frenguelli) C.E. Wetzel, E. Sar & Ector, 2017
Cosmioneis pusilla (W.Smith) D.G.Mann & A.J.Stickle, 1990 accepted as Navicula pusilla f. pusilla W. Smith, 1853
Cosmioneis pusilla var. incognita (Krasske) M.Aboal, 2003 accepted as Navicula incognita Krasske, 1932
Cosmioneis reimeri R.L.Lowe & A.R.Sherwood, 2010 (uncertain > unassessed )