Compare Gyrosigma attenuatum
Gyrosigma acuminatum is smaller in size and more slender. In addition, G. acuminatum also has longitudinal and transverse striae that are equally spaced. Gyrosigma terryanum is larger, with range in length of 340-450 µm. Gyrosigma balticum reaches larger maximum lengths than G. attenuatum, and the center of the valve has parallel margins.
LM scalebar = 10 µm
Length Range
130-255 µm
130-255 µm
Width Range
20-28 µm
20-28 µm
Striae in 10 µm
12-14 transverse; 10-12 longitudinal
12-14 transverse; 10-12 longitudinal
Length Range
77-153 µm
77-153 µm
Width Range
11-18 µm
11-18 µm
Striae in 10 µm
transverse 18-20; longitudinal 18-22
transverse 18-20; longitudinal 18-22
