Navicula whitefishensis
Bahls 2012 Category: Symmetrical biraphid
BASIONYM: Navicula whitefishensis Bahls 2012
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - March 2013
Length Range: 46-60 µm
Width Range: 11.3-14.2 µm
Striae in 10 µm: 12-14
Description
Valves are broadly lanceolate with abruptly protracted, narrow subcapitate apices. The axial area is narrow, widening gradually toward a large, rounded central area. The central area is 6-8 μm in diameter. The raphe is filiform to weakly lateral. Proximal raphe ends expanded and weakly deflected to one side. Terminal raphe fissures are curved, opening toward the secondary side. Striae are strongly radiate throughout most of valve, becoming parallel then convergent only near the apices. Striae number 12-14 in 10 μm. Areolae number 28-30 in 10 μm.
Original Description
Basionym: Navicula whitefishensis
Author: Bahls 2012
Length Range: 46-60 µm
Width Range: 11.3-14.2 µm
Striae in 10 µm: 12-14
Original Description
Valves broadly lanceolate with abruptly protracted and narrow subcapitate apices. Length 46-60 μm, width 11.3-14.2 μm. Axial area narrow, gradually widening toward a very large, rounded central area. Central area 5.9-8.2 μm in diameter. Raphe filiform to weakly lateral. Proximal raphe ends relatively distant, expanded and weakly deflected to one side. Terminal raphe fissures curved, opening toward the secondary side. Lineolate striae radiate almost throughout, becoming parallel then convergent only very near the poles, 12-14 in 10 μm. Areolae rather indistinct under LM, 28-30 in 10 μm.
Original Images
Cite This Page:
Bahls, L. (2013). Navicula whitefishensis. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_whitefishensis
Species: Navicula whitefishensis
Contributor: Loren Bahls
Image Credit: Loren Bahls
- Apices narrow, with subcapitate ends
- Central area large
- Striae strongly radiate
Navicula whitefishensis has large valves with narrow subcapitate apices. The valve width is up to 14.2 µm. Striae are strongly radiate, except near valve ends. The central area is nearly round and large, 6-8 µm in diameter. The proximal raphe ends are expanded.
Compare
Navicula trivialis valves and central area are both smaller than N. whitefishensis, while N. oligotraphenta is smaller than N. trivialis. The striae of Navicula hasta are strongly radiate, but are more irregular near the center of the valve than in N. whitefishensis. The apices of N. hasta are not as narrow as N. whitefishensis. The central area of N. whitefishensis is large and distinct.
Navicula trivialis
Navicula hasta
Pantocsek 1892
Navicula oligotraphenta
Lange-Bertalot and Hofmann 1993
Citations
Bahls, L. (2012). Navicula whitefishensis, a new diatom (Bacillariophyta) from the Northern Rockies. Intermountain Journal of Sciences 18(1-4): 1-5.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Navicula whitefishensis is known only from two lakes in the Northern Rocky Mountains of Montana: Upper Whitefish Lake, Flathead County (holotype locality) and Redrock Lake in Glacier National Park. Here pH measured 7.4 and 7.1, respectively, and specific conductance measured 130 and 94 µS/cm, respectively.
Images
Redrock Lake, Glacier National Park, Montana: home of Navicula whitefishensis.
Credit/Source: Loren Bahls