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Placoneis abiskoensis

(Hust.) Lange-Bert. and Metzeltin 1996      Category: Symmetrical biraphid
BASIONYM: Navicula abiskoensis Hust. 1942

REPORTED AS: Navicula abiskoensis (Krammer and Lange-Bertalot 1986) | Navicula kincaidii (Sovereign 1963) 

Pinnularia turfosiphila


Placoneis amphibola

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - January 2014
Length Range: 33-46 µm
Width Range: 8.4-11.1 µm
Striae in 10 µm: 10-12


Valves are linear, with parallel or weakly concave margins. Valve margins may be triundulate in the largest specimens. Apices are rostrate to sub-capitate. The axial area is very narrow and widens slightly as it approaches a transversely rectangular central area. The raphe is weakly lateral and somewhat sinuous. Proximal raphe ends are inflated and bent to one side. Distal raphe ends are hooked towards the opposite side of the valve. Striae are strongly curved and radiate except at the ends, where they are straight and parallel. Areolae in the striae number about 26-30 in 10 µm.

Original Description

Basionym: Navicula abiskoensis
Author: Hust. 1942
Length Range: µm
Striae in 10 µm:

Original Description

Navicula abiskoensis n. sp. Schalen linear mit parallelen Seiten und breit un leicht kopfig vorgezogenen Enden, um 45 µ lang, etwa 10 µ breit. Raph gerade, fadenförmig, Polspalten nach derselben Seite abgebogen; Axialarea schmal linear, Zentralarea ziemlich groß, quer-elliptisch. Transapikalstreifen stark radial und leicht gekrümmt (gegen di Enden konvex), an den Polen fast senkrecht zur Mittellinie, nur die äußersten Streifen an der den Polspalten gegenüberliegenden Seite gegen die Enden konvergent; in der Mitte etwa 10-12 in 10 µ, gegen die Pole enger werdend, bis etwa 16 in 10 µ, sämtlich ziemlich grob punktiert, Punkte um 22 in 10 µ. Abb. 36.

Original Images

Cite This Page:
Bahls, L. (2014). Placoneis abiskoensis. In Diatoms of the United States. Retrieved May 21, 2018, from

Species: Placoneis abiskoensis

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Hustedt, F. (1942). Diatomeen aus der Umgebung von Abisko in Schwedisch-Lappland. Archiv für Hydrobiologie 39(1): 87-174 .

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

Metzeltin, D. and Witkowski, A. (1996). Diatomeen der Baren-Insel Susswasser und marine Arten. In: Iconographia Diatomologica (H. Lange-Bertalot, ed.), Vol. 4, Koeltz Scientific Books, Konigstein, 287 pp.

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

California Academy of Sciences (CAS)

Placoneis abiskoensis CAS

NCBI Genbank Taxonomy

Placoneis abiskoensis NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 194001

Autecology Discussion

Placoneis abiskoensis is widely distributed across the Northern Great Plains and Northern Rocky Mountains in streams, lakes, ponds, pools, and wetlands. It is rarely found in large numbers. The species was described from material collected in Swedish Lapland at 68 degrees north latitude (Hustedt 1942) and also reported from Bear Island in Arctic Norway (Metzeltin & Witkowski 1996) and from many other Arctic and Subarctic locations.


Pool on trail near Kintla Lake, Glacier National Park, Montana: home of Placoneis abiskoensis.

Credit/Source: Mike Pasichnyk

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

Placoneis abiskoensis

EMAP Response Plots

Placoneis abiskoensis

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.