Encyonopsis descriptiformis

Bahls 3013      Category: Asymmetrical biraphid
BASIONYM: Encyonopsis descriptiformis Bahls 2013

Encyonopsis descripta

 

Encyonopsis falaisensis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2013
Length Range: 22.6-34.1 µm
Width Range: 5.6-6.7 µm
Striae in 10 µm: 18-20 at valve center, 20-22 near the apices

Description

Valves are lanceolate with rostrate to short apiculate apices. Valves are not or only slightly dorsiventral. The axial area is narrow and close to the valve midline. The central area is large, round, and more or less 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 fissures are hooked toward the ventral side. Striae are radiate throughout.



Original Description

Basionym: Encyonopsis descriptiformis
Author: Bahls 2013
Length Range: 22.6-34.1 µm
Width Range: 5.6-6.7 µm
Striae in 10 µm: 18-20 near valve center, 20-22 near the apices

Original Description

Valves not or slightly dorsiventral, lanceolate with rostrate to short apiculate apices. Valve length 22.6–34.1 µm; valve width 5.6–6.7 µm. Axial area narrow, close to valve midline. Central area round, slightly asymmetric. Raphe weakly lateral, filiform near the proximal and distal ends. Proximal raphe ends weakly expanded, deflected dorsally. Distal raphe fissures hooked toward the ventral side. Striae radiate throughout, 18–20 in 10 µm near the valve center, 20–22 in 10 µm near the apices.

Original Images


Cite This Page:
Bahls, L. (2013). Encyonopsis descriptiformis. In Diatoms of the United States. Retrieved April 17, 2014, from http://westerndiatoms.colorado.edu/taxa/species/encyonopsis_descriptiformis

Species: Encyonopsis descriptiformis

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.

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

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Encyonopsis descriptiformis has been collected from a few remote lakes in northwestern Montana. Here pH ranges from 6.9 to 7.4 and specific conductance from 20 to 130 µS/cm.

Images

Upper Whitefish Lake, Flathead County, Montana: type locality of Encyonopsis descriptiformis.

Credit/Source: www.gather.com