Stauroneis acidoclinata

Lange-Bertalot and Werum 2004      Category: Symmetrical biraphid
BASIONYM: Stauroneis acidoclinata Lange-Bertalot and Werum 2004

Stauroneis absaroka

 

Stauroneis acidoclinatopsis

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - December 2011
Length Range: 35-70 µm
Width Range: 7.4-11.5 µm
Striae in 10 µm: 19-24

Description

Valves are linear-lanceolate to linear, with abruptly protracted subrostrate to subcapitate apices. External raphe fissures are weakly lateral. Proximal raphe ends are slightly curved and tipped with weakly expanded central pores. The axial area is narrow and linear, barely wider near the central area. The central area is a relatively broad stauros that is somewhat wider near the valve margins. Short striae are absent within in the stauros. Striae are weakly radiate near the center, becoming more strongly radiate toward the apices. Areolae are distinguishable in LM and number 20-30 in 10 µm.



Original Description

Basionym: Stauroneis acidoclinata
Author: Lange-Bertalot and Werum 2004
Length Range: 35-60 µm
Width Range: 8.5-10.5 µm
Striae in 10 µm: 21-23

Original Description

Schalen linear-lanzettlich bis linear, Enden ziemlich abrupt keilformig verschmalert, meistens breit rostrat vorgezogen und breit gerundet, niemals capitat or subcapitat. Lange 35-60 microns, Breite 8.5-10.5 microns. Innere und aussere Raphenspalten (nicht stark) lateral, Zentralporen (im LM undeutlich) seitlich abgekrummt. Axialarea annahernd linear, weder eng noch breit, zur Mitte etwas erweitert. Zentralarea als Stauros bis zu den Randern ausgedehnt und nur wenig erweitert. Streifen im mittleren Schalenteil massig, zu den Enden hin stark radial, 21-23/10 microns. Punkte auf den Streifen (im REM) transapikal verlangert, ca. 25-30/10 microns.

Original Images


Cite This Page:
Bahls, L. (2011). Stauroneis acidoclinata. In Diatoms of the United States. Retrieved July 28, 2014, from http://westerndiatoms.colorado.edu/taxa/species/stauroneis_acidoclinata

Species: Stauroneis acidoclinata

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.

Werum, M. and Lange-Bertalot, H. (2004). Diatoms in springs, from Central Europe and elsewhere under the influence of hydrogeology and anthropogenic impages. Iconographia Diatomologica 13: 1-417.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

Stauroneis acidoclinata CAS

North American Diatom Ecological Database (NADED)

NADED ID: 62109

Autecology Discussion

Stauroneis acidoclinata has been recorded from several ponds and small lakes in western Montana, including Glacier National Park, where pH is circumneutral (mean pH = 6.8) and specific conductance is very low (mean SC = 35 µS/cm).

Images

Bloody Dick Pond #1, Beaverhead County, Montana: home of Stauroneis acidoclinata.

Credit/Source: Loren Bahls