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Navicula schweigeri

L.L.Bahls 2012      Category: Symmetrical biraphid

Navicula salinarum


Navicula seibigiana

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - March 2012
Length Range: 39-49 µm
Width Range: 7.5-8.6 µm
Striae in 10 µm: 12-14


Valves are lanceolate with short, rostrate apices. Raphe branches are filiform. Proximal raphe ends are straight or deflected slightly to one side. Distal raphe fissures are hooked to the secondary side. The axial area is very narrow. The central area is small and lanceolate and bordered by irregularly shortened striae, often alternating long and short. Striae are radiate and become strongly convergent near the apices. Areolae number 32–36 in 10 μm and are barely visible in LM.

Original Description

Author: L.L.Bahls 2012
Length Range: 39-49 µm
Width Range: 7.5-8.6 µm
Striae in 10 µm: 12-14

Original Description

Valves lanceolate with short protracted and obtusely rounded ends, 39 – 49 μm long, 7.5 – 8.6 μm wide. Raphe filiform, proximal endings straight or deflected slightly to one side, distal raphe fissures hooked to the secondary side. Axial area very narrow. Central area small and lanceolate, bordered by irregularly shortened striae. Striae radiate, becoming strongly convergent toward the ends, 12 –14 in 10 μm, lineolae 32 – 36 in 10 μm, barely visible in LM. For measurements, n = 22 valves.

Original Images

Cite This Page:
Bahls, L. (2012). Navicula schweigeri. In Diatoms of the United States. Retrieved May 22, 2018, from

Species: Navicula schweigeri

Contributor: Loren Bahls

Reviewer: Mark Edlund


Bahls, L.L. (2012). Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains. Nova Hedwigia, Beiheft 141: 19–38.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

Navicula schweigeri has been found in 18 lakes and streams in western Montana and southern Alberta, where it is present in low numbers. This taxon prefers waters with neutral to somewhat alkaline pH (range = 7.1-8.7) and low to moderate levels of electrolytes (range = 90-201 μS/cm).


Lake McDonald in winter, Glacier National Park, Montana. Lake McDonald is home to Navicula schweigeri.

Credit/Source: National Park Service webcam photo.