Valve linear with straight to weakly concave sides or sometimes the middle is somewhat widened or with wavy wavy sides. Ends without shoulders, broadly rounded, distinctly capitate. Axial area is thin; central is rhomboid. Straie in middle is radial to strongly radial, with ends strongly convergent(Krammer 1992a).
This taxon is widely distributed in water of fairly low mineral content and is considered pH indifferent. It can be found in a wide range of habitats(Krammer 1992a).