Encyonopsis falaisensis

(Grunow) Krammer 1997      Category: Asymmetrical biraphid
BASIONYM: Navicula falaisensis Grunow in Van Heurck 1880
SYNONYM(S): Cymbella falaisensis Krammer & Lange-Bertalot 1985 
REPORTED AS: Cymbella falaisensis (Krammer & Lange-Bertalot 1986, p. 326, pl. 134, figs. 14-22) 

Encyonopsis descriptiformis

 

Encyonopsis hustedtii

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - May 2013
Length Range: 20-36 µm
Width Range: 5.0-6.1 µm
Striae in 10 µm: 16-18 at the valve center, 19-22 near the apices

Description

Valves are lanceolate to linear-lanceolate and nearly symmetric with respect to the apical axis. Apices are short and subrostrate. The axial area is narrow. The central area is rounded, moderately large, and somewhat asymmetric. The raphe is lateral. Proximal raphe ends are deflected toward the dorsal side. Terminal raphe ends are hooked toward the ventral side. Striae are radiate throughout. Areolae are very fine and difficult to resolve in LM.



Original Description

Basionym: Navicula falaisensis
Author: Grunow in Van Heurck 1880
Length Range: µm
Striae in 10 µm:

Original Description

Original Images


Cite This Page:
Bahls, L. (2013). Encyonopsis falaisensis. In Diatoms of the United States. Retrieved December 07, 2016, from http://westerndiatoms.colorado.edu/taxa/species/encyonopsis_falaisensis

Species: Encyonopsis falaisensis

Contributor: Loren Bahls

Reviewer: Pat Kociolek

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.

Grunow, A. (1880). Bemerkungen zu den Diatomeen von Finnmark, dem Karischen Meere und vom Jenissey nebst Vorarbeiten für Monographie der Gattungen Nitzschia, Achnanthes, Pleurosigma, Amphiprora, Plagiotropis, Hyalodiscus, Podosira und einiger Navicula-Gruppen. Kongliga Svenska Vetenskaps-Akademiens Handligar, ser. 4, 17(2): 16-121; pls. I-VII.

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

Krammer, K. and Lange-Bertalot, H. (1985). Naviculaceae Neue und wenig bekannte Taxa, neue Kombinationen und Synonyme sowie Bemerkungen zu einigen Gattungen. Bibliotheca Diatomologica 9:5-230, 43 pls.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Van Heurck, H. (1880). Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Encyonopsis falaisensis CAS

North American Diatom Ecological Database (NADED)

NADED ID: 203007

Autecology Discussion

Encyonopsis falaisensis is common in small headwater lakes, ponds and springs in the northern Rocky Mountains, where it may be associated with E. cesatii. These waters tend to be cold, somewhat alakaline, and with low to moderate levels of dissolved solids. Krammer & Lange-Bertalot (1986) report this species as common in oligotrophic waters of northern Europe and in the mountains of middle Europe.

Images

Kootenai Pond, Glacier National Park, Montana: home of Encyonopsis falaisensis and Encyonopsis cesatii.

Credit/Source: Loren Bahls

Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Encyonopsis falaisensis.

Credit/Source: Montana Diatom Database

EMAP Assessment

The Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Over 1200 streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.


EMAP Distribution

Encyonopsis falaisensis


EMAP Response Plots

Encyonopsis falaisensis


EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.