Compare Gyrosigma acuminatum
Compare
Gyrosigma attenuatum is similar in shape but valves are much larger and the striae are more coarse. In addition, the longitudinal striae are more distinct than the transverse striae. The proximal raphe ends of G. rautenbachiae extend farther toward the valve margin and cross the first row of longitudinal striae. Gyrosigma spencerii is considered synonymous with G. acuminatum.
LM scalebar = 10 µm
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
Gyrosigma attenuatum
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