Gomphonema intricatum var. pumilum has a protracted headpole, nearly parallel sides, and a narrow axial area with a rectangular central area. Gomphonema tenellum has a more linear valve outline. Gomphonema intricatum var. minor is smaller (12-18 µm in length and 2.5-3.4 µm in width) than var. pumilum. Lack of areolae "crowded", or more dense, at the headpole and presence of external C-shaped flaps separate this taxon from G. intricatum and other members of the group.

LM scalebar = 10 µm
G Pygmaeum 111316A 005Rev G Pygmaeum 111316A 004Rev G Pygmaeum 111316A 001Rev G Pygmaeum 111361 008Rev G Pygmaeum 111316A 003Rev
Length Range
10-40 µm
Width Range
3-5 µm
Striae in 10 µm
10-13 in the center, 14-16 at the footpole

Also compare to

Gomphonema intricatum var. pumilum


Gomphonema tenellum


Gomphonema intricatum var. minor