Compare Prestauroneis integra
Compare
Prestauroneis protracta valves are linear to linear-lanceolate with rostrate, rounded apices. Navicula genovefae is smaller length and breadth, and the central striae are more coarse.
LM scalebar = 10 µm
Length Range
26.6-43.0 µm
26.6-43.0 µm
Width Range
9.3-12.6 µm
9.3-12.6 µm
Striae in 10 µm
9.9-15 at center of the valve, 15.7-20.8 near the apices
9.9-15 at center of the valve, 15.7-20.8 near the apices
Navicula genovefae
Length Range
18.8-25.1 µm
18.8-25.1 µm
Width Range
5.5-5.9 µm
5.5-5.9 µm
Striae in 10 µm
14-16 at midvalve; 19-21 toward the apices
14-16 at midvalve; 19-21 toward the apices