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Gomphonema manubrium has a higher stria density, a lanceolate axial area and distinctly inflated central area.

LM scalebar = 10 µm
G Reimeri 15612C 12182015 01 Cl G Reimeri 15592C 02262016 05  Gomphonema  Sesqa Cl G Reimeri 15592C 02262016 02  Gomphonema  Sesqa Cl G Reimeri 15592C 02262016 01  Gomphonema  Sesqa Cl G Reimeri 15592C 02262016 03  Gomphonema  Sesqa Cl G Reimeri 15612C 03232016 05 Cl
Length Range
25.5-73.3 µm
Width Range
8-11.5 µm
Striae in 10 µm
7.5-9

Gomphonema manubrium

Fricke 1904

Gomphonema manubrium LM6 Gomphonema manubrium LM5 Gomphonema manubrium LM1 Gomphonema manubrium LM7 Gomphonema manubrium LM3 Gomphonema manubrium LM2
Length Range
31.9-39.9 µm
Width Range
8.9-9.8 µm
Striae in 10 µm
11-14 in the center valve, 14-16 at the ends