Petersen 1915 Category: Symmetrical biraphid
BASIONYM: Stauroneis agrestis Petersen 1915
Contributor: Loren Bahls - May 2012
Length Range: 23-27 µm
Width Range: 4.5-5.5 µm
Striae in 10 µm: about 40
Valves are linear with slightly convex margins and capitate apices. The axial area is linear and very narrow, widening slightly near the central area. The central area is a broad stauros shaped like a bow tie. The raphe is filiform and straight, with slightly expanded proximal ends. Striae are slightly curved and strongly radiate. Areolae are difficult to resolve in LM and number near 40 in 10 µm.
Basionym: Stauroneis agrestis
Author: Petersen 1915
Length Range: µm
Striae in 10 µm:
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.
Petersen, J.B. (1915). Studier over danske aerophile alger. Mem. Acad. R. Sci. Lett. Danmark, 7. Ser. 12: 269-380.
Van de Vijver, B., Beyens, L. and Lange-Bertalot, H. (2004). The genus Stauroneis in Arctic and Antarctic Regions. Bibliotheca Diatomologica 50, 312 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.
Stauroneis agrestis has been recorded from small lakes, ponds and streams in the northern Rocky Mountains where mean pH is 6.6 and mean conductance is 9 µS/cm. Van de Vijver et al. (2004) report S. agrestis as an aerophile that is widespread in the Arctic. Werum and Lange-Bertalot (2004) report it from springs in Germany and the central Alps.
Atlantic Pond, Atlantic Creek drainage, Glacier National Park, MT: home of Stauroneis agrestis.
Credit/Source: Loren Bahls