Staurophora columbiana

Bahls 2013      Category: Symmetrical biraphid
BASIONYM: Staurophora columbiana Bahls 2013

REPORTED AS: Navicula sp. 6 PISCES fo. 1 (Cumming et al. 1995) | Navicula sp. 6 PISCES fo. 2 (Cumming et al. 1995) 

Staurophora brantii

 

Staurophora soodensis

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - June 2012
Length Range: 35-54 µm
Width Range: 7.9-12.7 µm
Striae in 10 µm: 15-20

Description

Valves are linear-lanceolate to elliptic-lanceolate with subrostrate apices. Valves are strongly arched transapically; valve face and mantle are indistinguishable. Axial area is very narrow. Central area is small and irregular in shape; a distinct transverse fascia is lacking. Raphe is filiform with straight and slightly expanded proximal ends. Distal raphe ends are hooked in the same direction. Striae are weakly radiate at valve center to parallel or slightly convergent at the apices. Striae are irregularly shortened and more widely spaced near the center. Areolae are very fine and difficult to resolve in LM.

Frustules may occur with “Janus valves”, two distinct morphologies within a single frustule. The description above refers to “normal” valves. In Janus valves, the central area is large and rounded. Proximal raphe ends are more distant than in normal valves. Striae are irregularly spaced.



Original Description

Basionym: Staurophora columbiana
Author: Bahls 2013
Length Range: 35-54 µm
Width Range: 7.9-12.7 µm
Striae in 10 µm: 15-20

Original Description

Valves linear-lanceolate to elliptic-lanceolate with subrostrate apices. Valves strongly arched in transapical axis; valve face and mantle indistinguishable. Valve length 35–54 μm; valve width 7.9–12.7 μm. Axial area very narrow. Central area small and irregular; transverse fascia lacking. Raphe filiform with straight and slightly expanded proximal ends. Terminal raphe fissures hooked in the same direction. Striae finely punctate, weakly radiate at valve center to parallel or slightly convergent at apices, 15–20 in 10 μm. Striae irregularly shortened and more widely spaced near valve center. Areolae difficult to resolve in LM. Janus valves present with large rounded central area, more distant proximal raphe ends, and more irregularly spaced striae.

Original Images


Cite This Page:
Bahls, L. (2012). Staurophora columbiana. In Diatoms of the United States. Retrieved November 25, 2014, from http://westerndiatoms.colorado.edu/taxa/species/staurophora_columbiana

Species: Staurophora columbiana

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

Bahls, L. (2013). New diatoms (Bacillariophyta) from western North America. Phytotaxa 82(1): 7-28.

Cumming, B.F., Wilson, S.E., Hall, R.I. and Smol, J.P. (1995). Diatoms from British Columbia (Canada) Lakes and their relationship to salinity, nutrients and other limnological variables. Bibliotheca Diatomologica 31: 1-207.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Staurophora columbiana has been collected from three shallow saline lakes on the Northwestern Great Plains in central Montana. The pH of these lakes measured a constant 9.20 and specific conductance ranged from 44100 to 67800 µS/cm.

Images

Kingsbury Lake, Chouteau County, Montana: holotype locality of Staurophora columbiana.

Credit/Source: Loren Bahls

Kingsbury Lake, Chouteau County, Montana: home of Staurophora columbiana.

Credit/Source: Loren Bahls