Compare Gomphonema vibrioides
Gomphonema dichotomum striae are not punctate.
Morphotype 1 valves have acutely rounded apices, more tapered footpole, and just over 30 μm to 100 μm in length (Morales 2001).
Morphotype 2 valves have the same characteristics as morphotype 1, but with greater curvature of the dorsal valve (Morales 2001).
LM scalebar = 10 µm
Length Range
70-118 µm
70-118 µm
Width Range
9-14 µm
9-14 µm
Striae in 10 µm
8-11 in the center valve, 9-15 at the ends
8-11 in the center valve, 9-15 at the ends
Also compare to
Gomphonema dichotomum
BioData Reference
Krammer and Lange-Bertalot 2/4 Pl 84 Fig 4-8
Gomphonema intricatum var. vibrio
BioData Reference
Kociolek and Stoermer 1991 Fig 30-37