Navicula winona

Bahls 2012      Category: Symmetrical biraphid
BASIONYM: Navicula winona Bahls 2012

Navicula wildii

 

Navicymbula pusilla

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - March 2012
Length Range: 39-52 µm
Width Range: 7.2-8.2 µm
Striae in 10 µm: 12-13

Description

Valves are narrowly lanceolate with gradually attenuated, very narrow subcapitate apices. The raphe is filiform. Proximal raphe ends are bent to the secondary side. Distal raphe fissures are also bent to the secondary side. The axial area is narrow and merges into a lanceolate to rhombic central area formed by irregularly shortened and more widely spaced striae. Striae are radiate at the valve center, become parallel near the valve ends and then convergent at the apices. Areolae are coarse, number 24–28 in 10 μm and are easily distinguished in LM.



Original Description

Basionym: Navicula winona
Author: Bahls 2012
Length Range: 39-52 µm
Width Range: 7.2-8.2 µm
Striae in 10 µm: 12-13

Original Description

Valves narrowly lanceolate with gradually attenuated and very narrow subcapitate ends, 39–52 μm long, 7.2–8.2 μm wide. Raphe filiform, proximal endings bent to the secondary side, distal raphe fissures hooked to the secondary side. Axial area narrow, merging into a lanceolate to rhombic central area formed by irregularly shortened and more widely spaced striae. Striae radiate, becoming parallel then convergent at the ends, 12–13 in 10 μm. Striae lineolae coarse, 24–28 in 10 μm, easily distinguished in LM. For measurements, n = 23 valves.

Original Images


Cite This Page:
Bahls, L. (2012). Navicula winona. In Diatoms of the United States. Retrieved October 20, 2014, from http://westerndiatoms.colorado.edu/taxa/species/navicula_winona

Species: Navicula winona

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

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)

NADED ID:

Autecology Discussion

Navicula winona has been collected from three lakes in Flathead County, Montana. These lakes are alkaline (pH range = 7.2-7.8) with moderate levels of electrolytes (specific conductance range = 140-332 μS/cm). This taxon is named for Lake Winona in the remote North Fork Flathead River Valley on the western edge of Glacier National Park.

Images

Lake Winona, Glacier National Park, Montana: type locality for Navicula winona.

Credit/Source: Billy Schweiger, National Park Service.