Compare

Cosmioneis reimeri is most similar to in shape to C. grossepunctata but C. reimeri is larger and more lanceolate. Cosmioneis reimeri is also greater in maximum length than C. grossepunctata (62 μm vs. 38 μm) and maintains its distinct lanceolate shape and higher stria density.

LM scalebar = 10 µm
Cosmioneis reimeri LM6 Cosmioneis reimeri LM1 Cosmioneis reimeri LM5 Cosmioneis reimeri LM4 Cosmioneis reimeri LM7 Cosmioneis reimeri LM3 Cosmioneis reimeri LM2
Length Range
31-61.5 µm
Width Range
11-18 µm
Striae in 10 µm
13-14 in the center, 19 near the ends

Also compare to

Cosmioneis grossepunctata

(Hust.) D.G.Mann