Compare Gomphonema duplipunctatum
Compare
Gomphonema duplipunctatum may be distinguished from G. parvulum and other small species of Gomphonema by its rhombic-lanceolate valves, unprotracted apices, and the two isolated stigmoids in the central area.
Gomphonema germainii is similar outline and stria density but has a single stigmoid.
Gomphonema signyensis also has two stigmoids and overlaps in size, but differs in valve outline.
LM scalebar = 10 µm
Length Range
18.6-34.5 µm
18.6-34.5 µm
Width Range
4.8-6.3 µm
4.8-6.3 µm
Striae in 10 µm
9-14
9-14
Gomphonema germainii
Length Range
24.7-43.8 µm
24.7-43.8 µm
Width Range
4.6-6.3 µm
4.6-6.3 µm
Striae in 10 µm
10-12 at the valve center, 12-14 at the headpole, 14-15 at the footpole
10-12 at the valve center, 12-14 at the headpole, 14-15 at the footpole
Also compare to
Gomphonema parvulum
BioData Reference
Krammer and Lange-Bertalot 2/4 Pl 76 Fig 1-7