Diatoms of North AmericaDiatoms of North America
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Compare Cosmioneis pusilla

(W.Smith) D.G.Mann and Stickle 1990

Compare

Cosmioneis delawarensis has larger valves and coarser areolae. 

LM scalebar = 10 µm
Cosmioneis pusilla LM7 Cosmioneis pusilla LM6 Cosmioneis pusilla LM4 Cosmioneis pusilla LM5 Cosmioneis pusilla LM3 Cosmioneis pusilla LM2 Cosmioneis pusilla LM1
Length Range
23-46 µm
Width Range
13-20 µm
Striae in 10 µm
15-18 in the center valve; 17-20 at the ends

Also compare to

Cosmioneis delawarensis

(Grunow ex Cleve) D.G.Mann in Round et al. 1990