Cymbopleura anglica
(Lagerstedt) Krammer 2003 Category: Asymmetrical biraphid
BASIONYM: Cymbella anglica Lagerstedt 1873
REPORTED AS: Cymbella naviculiformis (Patrick & Reimer 1975, p. 31)
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - July 2012
Length Range: 39-52 µm
Width Range: 13.0-18.2 µm
Striae in 10 µm: 10-12 on the dorsal side in the valve center, slightly higher density on ventral side and near apices
Description
Valves are elliptic and slightly to moderately dorsiventral. Apices are rostrate to subcapitate and bluntly rounded. The axial area is narrow and expands gradually towards a large, rounded central area. The raphe is lateral and becomes filiform near the proximal ends, which are somewhat inflated and deflected toward the ventral margin. Distal raphe ends are deflected dorsally. Striae are slightly radiate throughout the valve and somewhat more closely spaced on the ventral side and near the apices. Areolae are easily resolved in LM and number 24-28 in 10 µm.
Original Description
Basionym: Cymbella anglica
Author: Lagerstedt 1873
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Bahls, L. (2012). Cymbopleura anglica. In Diatoms of the United States. Retrieved May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/species/cymbopleura_anglica
Species: Cymbopleura anglica
Contributor: Loren Bahls
Reviewer: Sam Rushforth
Image Credit: Loren Bahls
- Valves elliptic
- Central area large
- Areolae 24-28 in 10 µm
- Raphe lateral
- Apices bluntly rounded
Cymbopleura anglica has moderately large elliptic and somewhat dorsiventral valves with bluntly rounded apices and a large central area. The raphe is lateral, becoming filiform near the proximal and distal ends. Areolae in the striae are easily resolved in LM and number 24-28 in 10 µm.
Compare
Cymbopleura amphicephala and C. naviculiformis have smaller valves and striae with higher areola density. Cymbopleura amphicephala also has a filiform raphe, but the central area is smaller. Valves of C. naviculiformis are more narrow and more lanceolate.
Cymbopleura amphicephala
Cymbopleura naviculiformis
Citations
Krammer, K. (2003). Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. Diatoms of Europe. Diatoms of the European Inland Waters and Comparable Habitats 4: 1-530.
Lagerstedt, N.G.W. (1873). Sötvattens-Diatomaceer från Spetsbergen och Beeren Eiland. Bihang till Kongliga Svenska Vetenskaps-Akademiens Handlingar 1 (14): 1-52, 2 pls.
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 44599
Autecology Discussion
Cymbopleura anglica is uncommon in lakes and ponds and in streams below lakes and ponds in the northern Rocky Mountains of Idaho and western Montana. Here it prefers cool and somewhat alkaline oligotrophic waters with low electrical conductance (see table below). Krammer (2003) reports this species as widely distributed in nordic-alpine and subarctic areas of Europe, where it prefers oligotrophic waters with lower electrolyte content.
Images
Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Cymbopleura anglica.
Credit/Source: Montana Diatom Database
Medicine Grizzly Lake, Glacier National Park, Montana: home of Cymbopleura anglica.
Credit/Source: Loren Bahls