Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia transversa

(A. Schmidt) Mayer 1940

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Pinnularia transversa is similar to P. nobilis var. regularis, P. domingensis and P. gentilis as all these species have linear valves with rounded ends. These species, however, are relatively wide compared to their length.

Pinnularia kwacksii has a broader axial area.

LM scalebar = 10 µm
Pinnularis transversa LM7 Pinnularis transversa LM2 Pinnularis transversa LM6 Pinnularis transversa LM1 Pinnularis transversa LM4 Pinnularis transversa LM3 Pinnularis transversa LM5
Length Range
168.6-224.5 µm
Width Range
16-19 µm
Striae in 10 µm
8-10

Pinnularia nobilis var. regularis

Krammer

Pinnularia nobilis ANSP BOY738 85 Pinnularia nobilis ANSP BOY738 71 Pinnularia nobilis ANSP BOY738 72 Pinnularia nobilis ANSP BOY738 51 Pinnularia nobilis ANSP BOY738 84 Pinnularia nobilis ANSP BOY738 75 Pinnularia nobilis ANSP BOY738 66
Length Range
200-270 µm
Width Range
32.5-39 µm
Striae in 10 µm
5

Pinnularia kwacksii

Camburn and Charles 2000

Pinnularia kwacksii LM6 Pinnularia kwacksii LM2 Pinnularia kwacksii LM4 Pinnularia kwacksii LM3 Pinnularia kwacksii LM1 Pinnularia kwacksii LM5 Pinnularia kwacksii LM7
Length Range
93-154 µm
Width Range
11-14 µm
Striae in 10 µm
12-13

Also compare to

Pinnularia gentilis

BioData Reference
Krammer 2000 Pl 181 Fig 1 2 Pl 197 Fig 1-7

Pinnularia domingensis

(Cleve) Hust.