Cosmioneis

{{Short description|Genus of diatoms}}

{{Automatic taxobox

|image =

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|taxon = Cosmioneis

|authority = D.G.Mann & Stickle, 1990

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Cosmioneis is a genus of diatoms belonging to the family Cosmioneidaceae.{{cite web |title=Cosmioneis D.G.Mann & Stickle, 1990 :: Algaebase |url=https://www.algaebase.org/search/genus/detail/?genus_id=43693 |website=www.algaebase.org |access-date=17 April 2021}}

Species:

• Cosmioneis brasiliana {{small|(Cleve) C.E.Wetzel & Ector}}
• Cosmioneis capitata {{small|(Hustedt) Lange-Bertalot}}
• Cosmioneis citriformis {{small|R.L.Lowe & A.R.Sherwood}}