Cymbopleura lapponica
(Grunow) Krammer 2003 Category: Asymmetrical biraphid
BASIONYM: Cymbella lapponica Grunow in Cleve 1894
REPORTED AS: Cymbella lapponica (Krammer and Lange-Bertalot 1986, p. 330, pl. 137, figs. 12-17)
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Loren Bahls - December 2012
Length Range: 26.6-47.1 µm
Width Range: 7.2-9.6 µm
Striae in 10 µm: 16-19 at the valve center, 20-22 near the apices
Description
Valves are weakly dorsiventral, rhombic-lanceolate, tapering gradually from the middle to narrow, subapiculate apices. The axial area is broad and follows the valve midline. The central area is asymmetric, with the dorsal side more developed. The raphe is weakly lateral, narrowing toward the proximal and distal ends. Proximal raphe ends are deflected slightly toward the ventral side. Terminal raphe fissures are comma shaped and deflected dorsally. Striae are radiate throughout. Areolae number 28-30 in 10 µm.
Original Description
Basionym: Cymbella lapponica
Author: Grunow in Cleve 1894
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Bahls, L. (2012). Cymbopleura lapponica. In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cymbopleura_lapponica
Species: Cymbopleura lapponica
Contributor: Loren Bahls
Reviewer: Marina Potapova
Image Credit: Loren Bahls
- Valves rhombic-lanceolate
- Proximal raphe ends deflected ventrally
- Terminal fissures curved dorsally
- Central area relatively large
Cymbopleura lapponica has rhombic-lanceolate valves 7-10 µm wide. The central area is relatively large. Proximal raphe ends are deflected ventrally. The terminal fissures are curved to the dorsal side.
Compare
The valves of Encyonopsis cesatii var. geitleri are more narrow relative to their length, have a smaller central area, proximal raphe ends that are deflected dorsally and terminal fissures curved toward the ventral margin.
Encyonopsis montana
Citations
Cleve, P.T. (1894). Synopsis of the Naviculoid Diatoms, Part I. Kongliga Svenska-Vetenskaps Akademiens Handlingar 26(2):1-194, 5 pls.
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.
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.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 190016
Autecology Discussion
Cymbopleura lapponica has been collected in small numbers from six lakes, ponds, swamps and streams in the northern Rocky Mountains of Montana and Alberta. Here pH ranged from 7.78 to 8.04 and specific conductance varied from 129-183 µS/cm. Krammer (2003) reports this species from the subarctic (Spitsbergen), far northern Scandinavia, and the Alps. The type locality is in Swedish Lapland.
Images
Bullhead Lake, Glacier National Park, Montana: home of Cymbopleura lapponica.
Credit/Source: Loren Bahls