Stauroneis sacajaweae

Bahls 2012      Category: Symmetrical biraphid
BASIONYM: Stauroneis sacajaweae Bahls 2012

REPORTED AS: Stauroneis subhyperborea (Bahls 2010, p. 155, figs. 1-8) 

Stauroneis rex

 

Stauroneis schroederi

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - October 2012
Length Range: 54-80 µm
Width Range: 10.8-14.7 µm
Striae in 10 µm: 23-25

Description

Valves are lanceolate with gradually attenuated subrostrate apices. A deep pseudoseptum occupies each apex. The raphe is lateral, becoming filiform towards proximal ends, which are bent to one side and tipped with weakly inflated pores. Distal raphe ends are hooked in a direction opposite that of proximal ends. The axial area is about 3 times wider than the raphe and widens gradually towards central area. The central stauros is broad and shaped like a bow tie. Striae are strongly radiate throughout. Areolae number 18–22 in 10 μm.



Original Description

Basionym: Stauroneis sacajaweae
Author: Bahls 2012
Length Range: 54-80 µm
Width Range: 10.8-14.7 µm
Striae in 10 µm: 23-25

Original Description

Valves lanceolate with gradually attenuated subrostrate apices. A deep pseudoseptum occupies each apex (Fig. 15). Valve length 54–80 μm; valve width 10.8–14.7 μm. Raphe lateral, becoming filiform towards proximal ends, which are bent to one side and tipped with weakly inflated pores. Distal raphe ends hooked in a direction opposite that of proximal ends. Axial area c 3 x wider than raphe and widens gradually towards central area. Central stauros broad, shaped like a bow tie. Striae strongly radiate throughout, 23–25 in 10 μm. Areolae in striae 18–22 in 10 μm.

Original Images


Cite This Page:
Bahls, L. (2012). Stauroneis sacajaweae. In Diatoms of the United States. Retrieved September 15, 2014, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_sacajaweae

Species: Stauroneis sacajaweae

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

Bahls, L. (2010). Stauroneis in the Northern Rockies: 50 species of Stauroneis sensu stricto from western Montana, northern Idaho, northeastern Washington and southwestern Alberta, including 16 species described as new. Northwest Diatoms, Volume 4. The Montana Diatom Collection, Helena, 172 pp.

Bahls, L. (2012). Five new species of Stauroneis (Bacillariophyta, Stauroneidaceae) from the northern Rocky Mountains, USA. Phytotaxa 67: 1-8.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Stauroneis sacajaweae has been confirmed from only two localities, both headwater spring seeps at moderate elevations in the northern Rocky Mountains of Montana.

Images

Round Butte (left) and Square Butte (right) near Geraldine in Chouteau County, Montana. A spring seep at the base of Square Butte is the type locality for Stauroneis sacajaweae.

Credit/Source: Loren Bahls