Gomphoneis septa

(Moghadam) Kociolek, Stoermer and Bahls 1986      Category: Asymmetrical biraphid
BASIONYM: Gomphonema septa Moghadam 1969

Gomphoneis pseudokunoi

 

Gomphoneis trullata

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Pat Kociolek - February 2011
Length Range: 34-90 µm
Width Range: 11-15 µm
Striae in 10 µm: 11-12 at the center, 14-16 at the poles

Description

Valves lanceolate-clavate, with headpole rounded and slightly protracted. Footpole rounded. Valve tapers gently towards the headpole, more strongly towards the footpole, especially in shorter specimens. The raphe is undulate and lateral. The axial area is narrow at the poles, straight, widens at the center to form a small, somewhat rounded central area. A single round stigma is found in the central area. Striae are radiate throughout the length of the valve. Longitudinal lines are positioned on either side of the axial area; they are indistinct in some specimens. The apical pore field is small. This species is known only from Montana.

Comments: These metrics for length and breadth indicates valves can be slightly smaller (down to 34 µm in length, and 11 µm in breadth) than indicated in Kociolek et al. (1986)



Original Description

Basionym: Gomphonema septa
Author: Moghadam 1969
Length Range: µm
Striae in 10 µm:

Original Description

Original Images


Cite This Page:
Kociolek, P. (2011). Gomphoneis septa. In Diatoms of the United States. Retrieved April 21, 2014, from http://westerndiatoms.colorado.edu/taxa/species/gomphoneis_septa

Species: Gomphoneis septa

Contributor: Pat Kociolek

Reviewer: Rex Lowe

Citations

Kociolek, J.P., Stoermer, E.F. and Bahls, L.L. (1986). Observations on North America Gomphoneis III. Gomphoneis septa comb. nov. Canadian Journal of Biology 64(11):2764-2768.

Moghadam, F. (1969). An ecological and systematic study of the planktonic diatom communities in Flathead Lake, Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 121: 153-228.

Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Gomphoneis septa CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion