Compare

Gomphoneis pseudo-okunoi is very similar to this taxon, and may prove to be conspecific. Gomphonema olivaceoides has a lower stria density. Gomphonema olivaceoides var. hutchinsoniana has as lower stria density and capitate head- and footpoles.

LM scalebar = 10 µm
Gomphonema olivaceoides var densestriata LM1 Gomphonema olivaceoides var. densestriata LM2 Gomphonema olivaceoides var. densestriata LM3 Gomphonema olivaceoides var. densestriata LM5 Gomphonema olivaceoides var. densestriata LM6 Gomphonema olivaceoides var. densestriata LM4 Gomphonema olivaceoides var. densestriata LM7
Length Range
15-33 µm
Width Range
5.1-6.2 µm
Striae in 10 µm
16-18

Gomphonema olivaceoides var. hutchinsoniana

Patrick 1971

Gomphonema Olivaceoides Hutchinsoniana 17 668Px  Gc112789 Gomphonema Olivaceoides Hutchinsoniana 642Px F  Gc112789A Gomphonema Olivaceoides Hutchinsoniana 627Px 15  Gc112789 Gomphonema Olivaceoides Hutchinsoniana 622Px 19  Gc112789A Gomphonema Olivaceoides Hutchinsoniana 623Px B  Gc112789A Gomphonema Olivaceoides Hutchinsoniana 595Px 11  Gc112789 Gomphonema Olivaceoides Hutchinsoniana 551Px 16  Gc112789
Length Range
18.4-23.4 µm
Width Range
5.5-6.1 µm
Striae in 10 µm
11.7-14.3

Gomphoneis pseudo-okunoi

Tuji 2005

Gomphoneis pseudo-okunoi LM7 Gomphoneis pseudo-okunoi LM6 Gomphoneis pseudo-okunoi LM3 Gomphoneis pseudo-okunoi LM2 Gomphoneis pseudo-okunoi LM5 Gomphoneis pseudo-okunoi LM4 Gomphoneis pseudo-okunoi LM1
Length Range
11-30 µm
Width Range
4-7 µm
Striae in 10 µm
13-15

Also compare to

Gomphoneis olivaceoides

(Hust.) J.R.Carter ex A.Tuji