Navicula cryptotenella and N. wygaschii have higher stria densities. In these two species and in N. mediocostata, areola density is also higher and areolae are difficult to resolve in LM .

LM scalebar = 10 µm
Navicula supleeorum LM7 Navicula supleeorum LM6 Navicula supleeorum LM5 Navicula supleeorum LM4 Navicula supleeorum LM3 Navicula supleeorum LM2 Navicula supleeorum LM1
Length Range
23-32 µm
Width Range
6.1-7.0 µm
Striae in 10 µm
12-14

Also compare to

Navicula mediocostata

E.Reichardt 1988

Navicula wygaschii

Lange-Bert. 2001

Navicula cryptotenella

Lange-Bert. 1985