Diatoms of North AmericaDiatoms of North America
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Compare Frustulia crassinervia

(Bréb.) Lange-Bert. and Krammer 1996

Compare

Frustulia inculta valve margins are very slighty undulate, a larger porte-crayon, and lower stria density.

Frustulia quadrisinuata has much broader apices and coarser valves.

Frustulia saxonica has less undulate margins and broader apices.

LM scalebar = 10 µm
Frustulia crassinverva LM6 Frustulia crassinverva LM5 Frustulia crassinverva LM4 Frustulia crassinverva LM3 Frustulia crassinverva LM2 Frustulia crassinverva LM1
Length Range
34.5-48.0 µm
Width Range
9.0-10.5 µm
Striae in 10 µm
33-35 in the center

Frustulia inculta

Siver, Pelczar and Hamilton 2009

Frustulia incluta LM1 Frustulia incluta LM2 Frustulia incluta LM3 Frustulia incluta LM4 Frustulia incluta LM5 Frustulia incluta LM6
Length Range
54-74 µm
Width Range
11.5-14.0 µm
Striae in 10 µm
28-30 in the center valve, 27-28 at the ends

Frustulia quadrisinuata

Lange-Bert. 1996

Frustulia quadrisinuata LM2 Frustulia quadrisinuata LM1 Frustulia quadrisinuata LM5 Frustulia quadrisinuata LM4 Frustulia quadrisinuata LM3
Length Range
58.0-67.0 µm
Width Range
14.0-15.0 µm
Striae in 10 µm
30-31

Frustulia saxonica

Rabenh. 1850

Frustulia saxonica LM7 Frustulia saxonica LM6 Frustulia saxonica LM5 Frustulia saxonica LM4 Frustulia saxonica LM3 Frustulia saxonica LM2 Frustulia saxonica LM1
Length Range
46.5-87.5 µm
Width Range
12.5-17.5 µm
Striae in 10 µm
30-33