Placoneis abiskoensis

(Hustedt) Lange-Bertalot and Metzeltin 1996      Category: Symmetrical biraphid
BASIONYM: Navicula abiskoensis Hustedt 1942

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

Pinnularia suchlandtii


Placoneis anglophila

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - January 2014
Length Range: 33.3-46.0 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 very ends, where they are straight and parallel. Areolae in the striae number about 26-30 in 10 µm.

Original Description

Basionym: Navicula abiskoensis
Author: Hustedt 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 November 28, 2015, 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.) Susswasserflora 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

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