Navicula leptostriata
Jørgensen 1948 Category: Symmetrical biraphid
BASIONYM: Navicula leptostriata Jørgensen 1948
REPORTED AS: Navicula heimansii (Van Dam and Kooyman 1982)
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Loren Bahls - March 2012
Length Range: 33-39 µm
Width Range: 4.9-5.7 µm
Striae in 10 µm: 19-20
Description
Valves are narrowly lanceolate with acutely rounded, subtly protracted apices. Valves are lightly silicified and features tend to be faint and difficult to resolve. The raphe is filiform. Proximal raphe ends are very close and deflected to the primary side. The axial area is very narrow. The central area is small, transversely widened, and asymmetrical with irregular borders. Striae are curved and strongly radiate near the valve middle, becoming strongly convergent near the apices. Areolae are very close together and cannot be distinguished in LM.
Original Description
Basionym: Navicula leptostriata
Author: Jørgensen 1948
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Bahls, L. (2012). Navicula leptostriata. In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_leptostriata
Species: Navicula leptostriata
Contributor: Loren Bahls
Reviewer: Sam Rushforth
Image Credit: Loren Bahls
- Valves narrowly lanceolate
- Central area small
- Proximal raphe ends close together
- Striae curved, radiate near center
- Striae convergent at apices
Navicula leptostriata has narrowly lanceolate valves with a small central area. Proximal raphe ends are deflected to the primary side and are positioned close to one another. Striae are 18-20 in 10 µm, curved and radiate at the valve center and convergent at the apices.
Compare
Navicula notha has more widely spaced striae and proximal raphe ends that are spaced farther apart. Navicula angusta has more linear valves, a larger central area, straight and more widely spaced striae, and proximal raphe ends that are spaced farther apart.
Navicula notha
Navicula angusta
Citations
Jørgenson, E.G. (1948). Diatom communities in some Danish lakes and ponds. Det Kongelige Danske Videnskabernes Selskab, Biologiske Shrifter 5(2): 1-140.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 46095
Autecology Discussion
Navicula leptostriata has been recorded from eight streams and small lakes in the northern Rocky Mountains, where it is typically associated with Navicula notha. The mean pH at these locations is 7.5 and the mean specific conductance is 154 µS/cm.
Images
Summit Lake, Waterton Lakes National Park, Alberta: home of Navicula leptostriata.
Credit/Source: Photo courtesy of Barb Johnston, Parks Canada.