Compare Ulnaria acus
Compare
Ulnaria ulna differs by wider (6.3-7.7 µm), needle shaped (parallel sides) valves. Ulnaria delicatissima valves have needle shaped valves with short, constricted apices. Fragilaria grunowii has more narrow valves (2-4 µm) and more attenuated, narrow apices. Both Fragilaria crotonensis and Fragilaria tenera are smaller in size. Fragilaria crotonensis often has an inflated central area, has a higher stria density, strongly narrowing apices and forms long, ribbon-like colonies. Fragilaria tenera forms stellate colonies.
LM scalebar = 10 µm
Length Range
60.5-251.6 µm
60.5-251.6 µm
Width Range
4.2-4.9 µm
4.2-4.9 µm
Striae in 10 µm
11-12
11-12
