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Navicula subrostellata differs from N. gregaria by the round central area and straight proximal raphe ends.

LM scalebar = 10 µm
Gc6604A  Nasecr Apiculata  Holo Circle1A Gc104413A  Gsn00987  Naamm3 Gc6604A  Nasecr Apiculata  Holo  Not In Circle1A Gc6604A  Nasecr Apiculata  Holo  Not In Circle3 Gc6604A  Nasecr Apiculata  Holo  Not In Circle2 Gc104413A  Gsn00987  Naamm2B
Length Range
27-31 µm
Width Range
6.0-6.8 µm
Striae in 10 µm
14-16

Navicula gregaria

Donkin 1861

Navicula gregaria LM4 Navicula gregaria LM5 Navicula gregaria LM3 Navicula gregaria LM7 Navicula gregaria LM6 Navicula gregaria LM2 Navicula gregaria LM1
Length Range
16-35 µm
Width Range
4.1-7.0 µm
Striae in 10 µm
14-18 in the center valve