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Compare Gyrosigma obtusatum

(Sullivant and Wormley) C.S. Boyer 1922

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Gyrosigma sciotoense has wider valves, an asymmetric central area, and external proximal raphe ends curved in opposite directions.

LM scalebar = 10 µm
Gyrosigma obtusatum LM5 Gyrosigma obtusatum LM1 Gyrosigma obtusatum LM3 Gyrosigma obtusatum LM6 Gyrosigma obtusatum LM77 Gyrosigma obtusatum LM22
Length Range
53-154 µm
Width Range
8-15 µm
Striae in 10 µm
22-26

Also compare to

Gyrosigma sciotoense

(W.S.Sullvant) Cleve

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