Encyonopsis descripta

(Hustedt) Krammer 1997      Category: Asymmetrical biraphid
BASIONYM: Navicula descripta Hustedt 1943
SYNONYM(S): Cymbella descripta (Hustedt) Krammer and Lange-Bertalot 1985 
REPORTED AS: Cymbella descripta (Krammer and Lange-Bertalot 1986, p. 327, figs. 135: 1-5) 

Encyonopsis dakotae

 

Encyonopsis descriptiformis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2013
Length Range: 25.7-29.9 µm
Width Range: 5.4-6.6 µm
Striae in 10 µm: 18-20 at valve center, 20-22 near the apices

Description

Valves are linear-lanceolate with capitate apices and not or only slightly dorsiventral. The axial area is narrow and positioned along the valve midline. The central area is large, round, and nearly symmetric. The raphe is weakly lateral, becoming filiform near the proximal and distal ends. Proximal raphe ends are weakly expanded and deflected dorsally. Distal raphe ends are curved toward the ventral side. Striae are radiate throughout.



Original Description

Basionym: Navicula descripta
Author: Hustedt 1943
Length Range: µm
Striae in 10 µm:

Original Description

Original Images


Cite This Page:
Bahls, L. (2013). Encyonopsis descripta. In Diatoms of the United States. Retrieved July 23, 2014, from http://westerndiatoms.colorado.edu/taxa/species/encyonopsis_descripta

Species: Encyonopsis descripta

Contributor: Loren Bahls

Reviewer: Mark Edlund

Citations

Bahls, L. (2013). Encyonopsis from western North America: 31 species from Alberta, Idaho, Montana, Oregon, South Dakota, and Washington, including 17 species described as new. Northwest Diatoms, Volume 5. The Montana Diatom Collection, Helena, 46 pp.

Hustedt, F. (1943). Die Diatomeenflora einiger Hochgebirgsseen der Landschaft Davos in den schweizer Alpen. Internationale Revue der gesamten Hydrobiologie und Hydrographie 43:124-197, 225-280.

Krammer, K. (1997). Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 2. Encyonema part., Encyonopsis and Cymbellopsis. Bibliotheca Diatomologica 37:1-469.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA
Transfer INA

California Academy of Sciences (CAS)

Encyonopsis descripta CAS

North American Diatom Ecological Database (NADED)

NADED ID: 203014

Autecology Discussion

Encyonopsis descripta has been collected from a few remote lakes in the Northern Rockies. Here pH ranges from 7.0 to 8.2 and specific conductance from 64 to 250 µS/cm.

Images

Lower Quartz Lake, Glacier National Park, Montana: home of Encyonopsis descripta.

Credit/Source: wikimedia.org