Spaulding, S.,
Edlund, M.
(2008).
Cosmioneis.
In Diatoms of North America.
Retrieved September 07, 2024, from https://diatoms.org/genera/cosmioneis
Symmetric Biraphid
Cosmioneis
Striae uniseriate, radial
Valve face flat, with broad valve mantle
Central area elliptic
Internal proximal raphe ends anchor-shaped
External proximal raphe ends expanded
Valves of species in the genus Cosmioneis are lanceolate to elliptic in outline, with capitate to rostrate ends. The valve face is flat, and the valve mantles are relatively broad. Striae are uniseriate and radial, and are composed of round to oval areolae. Striae become irregular near the central area. The axial area is narrow and...