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: 19.8-36.4 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 October 25, 2014, 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