Compare Navicula canalis
Compare
Navicula caterva is smaller and the areolae are not discernible. Navicula gregaria is larger and more lanceolate. Small specimens, however, of N. gregaria and N. canalis may easily be confused. Note that N. gregaria is relatively wider and the central area is more transapically expanded. Navicula namibica has a higher stria density (18-20 in 10 µm) and the central area is round.
LM scalebar = 10 µm
Length Range
19.6-25 µm
19.6-25 µm
Width Range
4.1-5.5 µm
4.1-5.5 µm
Striae in 10 µm
16-19
16-19
Navicula gregaria
Length Range
16-35 µm
16-35 µm
Width Range
4.1-7.0 µm
4.1-7.0 µm
Striae in 10 µm
14-18 in the center valve
14-18 in the center valve