Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia perinterrupta

Krammer 2000

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Pinnularia divergentissima var subrostrata is smaller and has striae that form a triangle shape between the central and apical striae.

Pinnularia birnirkiana is smaller and has less capitate ends.

Pinnularia pluvianiformis is smaller and is much more triundulate.

Pinnularia lacunicola has larger valves with only slightly protracted apices.

LM scalebar = 10 µm
Pinnularia perinterrupta LM3 Pinnularia perinterrupta LM7 Pinnularia perinterrupta LM1 Pinnularia perinterrupta LM5 Pinnularia perinterrupta LM2 Pinnularia perinterrupta LM6 Pinnularia perinterrupta LM4
Length Range
31.4-37.5 µm
Width Range
6.5-7 µm
Striae in 10 µm
12-13

Pinnularia divergentissima var. subrostrata

A.Cleve 1898

Pinnularia divergentissima subrostrata LM6 Pinnularia divergentissima subrostrata LM1 Pinnularia divergentissima subrostrata LM5 Pinnularia divergentissima subrostrata LM3 Pinnularia divergentissima subrostrata LM4 Pinnularia divergentissima subrostrata LM2 Pinnularia divergentissima subrostrata LM7
Length Range
28-38 µm
Width Range
5.5-6.1 µm
Striae in 10 µm
12-14

Pinnularia birnirkiana

Patrick and Freese 1961

Pinnularia birnirkiana LM3 Pinnularia birnirkiana LM5 Pinnularia birnirkiana LM2 Pinnularia birnirkiana LM4 Pinnularia birnirkiana LM6 Pinnularia birnirkiana LM1 Pinnularia birnirkiana LM7
Length Range
28.1-54.3 µm
Width Range
9.3-11.1 µm
Striae in 10 µm
10-12

Pinnularia pluvianiformis

Krammer 2000

Pinnularia pluvianiformis LM3 Pinnularia pluvianiformis LM6 Pinnularia pluvianiformis LM2 Pinnularia pluvianiformis LM4 Pinnularia pluvianiformis LM1 Pinnularia pluvianiformis LM7 Pinnularia pluvianiformis LM5
Length Range
24-28 µm
Width Range
5.6-5.9 µm
Striae in 10 µm
13-14

Pinnularia lacunicola

Patrick and Freese 1961

Pinnularia lacunicola LM5 Pinnularia lacunicola LM1 Pinnularia lacunicola LM2 Pinnularia lacunicola LM3 Pinnularia lacunicola LM6 Pinnularia lacunicola LM4 Pinnularia lacunicola LM7
Length Range
33-55 µm
Width Range
6.6-10.2 µm
Striae in 10 µm
11-15