Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia cardinaliculus

Cleve 1895

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Pinnularia cardinalis is somewhat similar in outline in the shape of the central area, but valves are much larger and have a complex raphe.

Pinnularia cuneicephala is similar in size and has a thickened sternum and cuneate apices. The apices of P. cuneicephala, however, are more acute and not rounded. Pinnularia cuneicephala also has a much wider axial area and lacks a fascia.

LM scalebar = 10 µm
112909b cardinaliculus 4 edited 112906b cardinaliculus 7 edited 112909b cardinaliculus 6 edited 112909b cardinaliculus 5 edited 112902b cardinaliculus 4 edited 112902b cardinaliculus 2 edited WALLINGFORD 12 T PIN31 3 edited
Length Range
76-123 µm
Width Range
15-19 µm
Striae in 10 µm
8-8.5

Pinnularia cuneicephala

(A.Mann) R.M.Patrick 1966

Pinnularia cuneicephala LM4 Pinnularia cuneicephala LM6 Pinnularia cuneicephala LM1 Pinnularia cuneicephala LM8 Pinnularia cuneicephala LM5 Pinnularia cuneicephala LM7 Pinnularia cuneicephala LM2
Length Range
79-142 µm
Width Range
14-19 µm
Striae in 10 µm
6-7

Also compare to

Pinnularia cardinalis

(Ehrenb.) W.Sm.