Encyonema sibericum

Krammer & Lange-Bertalot 1999      Category: Asymmetrical biraphid

REPORTED AS: Cymbella norvegica (Foged 1981, p. 73, plate XLV, figs 12, 13) 

Encyonema reimeri

 

Encyonema temperei

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2017
Length Range: 31-57 µm
Width Range: 5.3-6.9 µm
Striae in 10 µm: 10-14

Description

Valves are linear and weakly dorsiventral, with subrostrate apices. Dorsal and ventral margins are parallel and sometimes slightly tumid in the middle. The overall valve shape resembles a banana. The axial area is narrow and follows the mid line of the valve. The central area is a narrow transverse rectangle, interrupted occasionally on one or both margins by one or two short striae. The raphe is lateral and becomes filiform near the ends. External proximal raphe ends are weakly expanded and tipped toward the dorsal margin. Terminal raphe fissures are shaped like question marks and open toward the ventral margin. Striae are parallel to weakly radiate throughout. Areolae number 32-36 in 10 µm.



Original Description

Basionym:
Author: Krammer & Lange-Bertalot 1999
Length Range: 30-45 µm
Width Range: 5.8-6.7 µm
Striae in 10 µm: 12-14

Original Description

Areolae number 32-32 in 10 microns.

Original Images


Cite This Page:
Bahls, L. (2017). Encyonema sibericum. In Diatoms of the United States. Retrieved September 19, 2017, from http://westerndiatoms.colorado.edu/taxa/species/encyonema_sibericum

Species: Encyonema sibericum

Contributor: Loren Bahls

Reviewer: Marina Potapova

Citations

Foged, N. (1981). Diatoms in Alaska. Bibliotheca Phycologica, Band 53, J. Cramer, Vaduz, 317 pp.

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.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

This species is reported from Alaska (Foged 1981).The specimens presented on this page were collected from wet hummocks and in wetlands on the tundra of Nunavut, Canada (photos below). At the time of sampling, the pH of these waters was 7.15 and 6.90.

Images

Wet hummocks along the Baillie River in Nunavut, northern Canada: home of Encyonema sibericum.

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

A wetland on the tundra along the Back River in northern Canada: home of Encyonema sibericum.

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

Closeup of the wetland in the image above.

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