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Gomphonema superiorense

Kociolek and Stoermer 1991      Category: Asymmetrical biraphid

Gomphonema submehleri


Gomphonema truncatum

LM scalebar = 10 µm = 80 pixels.


Contributor: David R.L. Burge - December 2016
Length Range: 23-26 µm
Width Range: 3.6-4.2 µm
Striae in 10 µm: 13-14 in the valve center, 15-16 at the headpole, 14-15 at the footpole


Valves are narrow and lanceolate, tapering to protracted, rostrate apices. The apices are rounded and generally equal in size, however in some specimens the footpole is wider than the headpole. A stigmoid is present in the central area. The central area is bordered by a single shortened stria on each side. The striae are weakly radiate at the valve center, becoming parallel at the apices. The axial area is very narrow and lanceolate. The raphe is filiform and may be weakly curved in some specimens. The proximal raphe ends are simple and the distal ends hook to the one side.

Comparisons with similar taxa were made using Lange-Bertalot (1986).

Original Description

Author: Kociolek and Stoermer 1991
Length Range: 20-32 µm
Width Range: 4-6 µm
Striae in 10 µm: 11-13 in the valve center, 14-16 at the poles

Original Description

Valves broadest at the center, tapering gently to the protracted headpole and rounded base. Axial area is narrow. Central area is rectangular, formed by 1-2 shortened stria on either side. A stigma is present. The raphe is lateral, weakly undulate. Striae are radiate to parallel, 11-13 in 10 µm, 14-16 in 10 µm at the poles. Length 20-32, breadth 4-6 µm.

Original Images

Cite This Page:
Burge, D. (2016). Gomphonema superiorense. In Diatoms of the United States. Retrieved May 25, 2018, from

Species: Gomphonema superiorense

Contributor: David R.L. Burge

Reviewer: Loren Bahls


Kociolek, J.P. and Stoermer, E.F. (1991). Taxonomy and ultrastructure of some Gomphonema and Gomphoneis taxa from the Upper Laurentian Great Lakes. Canadian Journal of Botany 69: 1557-1576. 10.1139/b91-200

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Gomphonema superiorense CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Gomphonema superiorense was described from an epilithic littoral habitat at F.J. McLain State Park, Lake Superior, Houghton County, Michigan. The slide examined for this webpage was an epilithic sample from Superior Shoal, at a depth of 32ft. This taxon does not appear in the USGS BioData database.