Encyonopsis albertana

Bahls 2013      Category: Asymmetrical biraphid
BASIONYM: Encyonopsis albertana Bahls 2013

Encyonopsis aequalis

 

Encyonopsis cesatiformis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2013
Length Range: 14.3-22.5 µm
Width Range: 3.1-4.1 µm
Striae in 10 µm: 20-24

Description

Valves are narrowly lanceolate and moderately dorsiventral with rostrate apices slightly deflected ventrally. The dorsal margin is arched and the ventral margin is straight or weakly convex. The axial area is narrow, located about 1/3 the distance from the ventral margin to the dorsal margin. The central area is very small and continuous with the axial area. Raphe branches are filiform and bowed, concave to the dorsal margin. Proximal raphe ends are unexpanded and deflected dorsally. Distal raphe fissures are hooked toward the ventral margin. Striae are radiate.



Original Description

Basionym: Encyonopsis albertana
Author: Bahls 2013
Length Range: 14.3-22.5 µm
Width Range: 3.1-4.1 µm
Striae in 10 µm: 20-24

Original Description

Valves narrowly lanceolate, moderately dorsiventral, dorsal margin arched, ventral margin straight or weakly convex. Valve length 14.3–22.5 μm; valve width 3.1–4.1 μm. Apices rostrate, deflected ventrally. Axial area narrow, about 1/3 the distance from the ventral margin to the dorsal margin. Central area very small, continuous with the axial area. Raphe branches filiform and bowed, concave to the dorsal margin. Proximal raphe ends unexpanded, deflected dorsally; distal raphe fissures hooked toward the ventral margin. Striae radiate, 20–24 in 10 μm.

Original Images


Cite This Page:
Bahls, L. (2013). Encyonopsis albertana. In Diatoms of the United States. Retrieved October 31, 2014, from http://westerndiatoms.colorado.edu/taxa/species/encyonopsis_albertana

Species: Encyonopsis albertana

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.

Reichardt, E. (1997). Bermerkenswerte Diatomeenfunde aus Bayern. IV. Zwei neue Arten aus den Kleinen Ammerquellen. Berichte der Bayerischen Botanischen Gesellschaft (zur Erforschung der heimischen Flora) 68: 61-66.

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 albertana is widely distributed and locally abundant in lakes, beaver ponds, and spring creeks in southwestern Alberta and northwestern Montana. These waters are alkaline (pH range 7.2-9.2) with moderate levels of dissolved solids (specific conductance range 141-255 μS/cm).

Images

Blakiston Beaver Pond A, Waterton Lakes National Park, Alberta: home of Encyonopsis albertana.

Credit/Source: Barb Johnston, Parks Canada