Gomphonema distans

(Cleve-Euler) Lange-Bertalot and Reichardt in Lange-Bertalot and Genkal 1999      Category: Asymmetrical biraphid
BASIONYM: Gomphonema lagerheimii var. distans Cleve-Euler 1934
SYNONYM(S): Gomphonema angustatum var. distans (Cleve-Euler) Cleve-Euler 1955 

Gomphonema coronatum

 

Gomphonema elongatum

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - June 2016
Length Range: 26-46 µm
Width Range: 6.0-7.2 at the valve center µm
Striae in 10 µm: 9-13

Description

Valves are linear and triundulate. The headpole is subrostrate and the footpole is bluntly rounded. Valves are widest at the center valve. The axial area is narrow. The central area is a rectangular fascia, typically interrupted on one side by a shorter stria with an isolated stigma near the axial area. On some specimens, however, this shorter stria and stigma are absent. The raphe is lateral, becoming filiform near the proximal and terminal ends. Proximal raphe ends are straight. Terminal raphe fissures are deflected in the same direction, at about 45 degrees. Striae near the central area are parallel and curved; elsewhere they are radiate and straight. Areolae are very fine and difficult to distinguish in LM.



Original Description

Basionym: Gomphonema lagerheimii var. distans
Author: Cleve-Euler 1934
Length Range: µm
Striae in 10 µm: 5-6

Original Description

Original Images


Cite This Page:
Bahls, L. (2016). Gomphonema distans. In Diatoms of the United States. Retrieved August 23, 2017, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_distans

Species: Gomphonema distans

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

Cleve-Euler, A. (1934). The diatoms of Finnish Lapland. Societas Scientiarum Fennica. Commentationes Biologicae. 4(14):154 pp.

Cleve-Euler, A. (1953). Die Diatomeen von Schweden und Finnland. Teil III. Monoraphideae, Biraphideae 1. Authorized Reprint 1968, Bibliotheca Phycologica, Band 5, J. Cramer, Lehre.

Lange-Bertalot, H. and Genkal, S.I. (1999). Diatoms from Siberia I. Islands in the Arctic Ocean (Yugorsky-Shar Strait). Iconographia Diatomologica 6: 1-292.

Reichardt, E. (1999). Zur Revision der Gattung Gomphonema: Die Arten um G. affine/insigne, G. angustatum/micropus, G. acuminatum sowie gomphonemoide Diatomeen aus dem Oberoligozän in Böhmen. Annotated Diatom Micrographs. Edited by Horst Lange-Bertalot. Iconographia Diatomologica, Volume 8, A.R.G. Gantner.

Links & ID's

Index Nominum Algarum (INA)

Original INA
Transfer INA

California Academy of Sciences (CAS)

Gomphonema distans CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

This taxon was described from material collected in Finnish Lapland (Cleve-Euler 1934) and has been reported from Siberia (Lange-Bertalot and Genkal 1999). The specimens shown on this web page were collected from a lake and a pool in Nunavut, Canada, north of the Arctic Circle. The pH of these waters measured 8.30 and 8.10, respectively.

Images

September Mountains Lake, Nunavut, Canada: home of Gomphonema distans

Credit/Source: Beverly Boynton, Adventurers and Scientists for Conservation

September Mountains Lake, Nunavut, Canada: home of Gomphonema distans

Credit/Source: Beverly Boynton, Adventurers and Scientists for Conservation

Tundra Pool, Nunavut, Canada: home of Gomphonema distans

Credit/Source: Beverly Boynton, Adventurers and Scientists for Conservation