(Grunow) Lange-Bertalot and Krammer in Lange-Bertalot and Metzeltin 1996 Category: Symmetrical biraphid
BASIONYM: Stauroneis anceps var. siberica Grunow in Cleve and Grunow 1880
REPORTED AS: Stauroneis anceps var. americana (Reimer 1961)
Contributor: Loren Bahls - December 2011
Length Range: 54-68 µm
Width Range: 12-16 µm
Striae in 10 µm: 26 (center) - 32 (ends)
Valves are elliptic-lanceolate to lanceolate with rostrate to subcapitate apices. The raphe is filiform and straight. Proximal raphe ends are straight and weakly inflated. The axial area is very narrow and linear, widening slightly at the stauros. The stauros is narrow and typically constricted towards the valve margin. Short striae are sometimes present in the central area. Striae are parallel or slightly convergent at the center, becoming weakly radiate near the ends. Striae are closer together at the ends than at the center. Striae are very fine, often irregularly spaced, and number 24-32 in 10 µm. Areolae bordering the stauros are more prominent and more widely spaced than areolae elsewhere.
Basionym: Stauroneis anceps var. siberica
Author: Grunow in Cleve and Grunow 1880
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.
Cleve, P.T. and Grunow, A. (1880). Beiträge zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska-Vetenskaps Akademiens Handlingar, Vol: 17, Issue: 2, 121 pp., 7 pls.
Foged, N. (1974). Freshwater Diatoms in Iceland. Bibliotheca Phycologica, Band 15, J. Cramer, Vaduz, 118 pp. + 36 plates.
Lange-Bertalot, H. and Genkal, S.I. (1999). Diatoms from Siberia I. Islands in the Arctic Ocean (Yugorsky-Shar Strait). Iconographia Diatomologica 6: 1-292.
Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.
Metzeltin, D. and Witkowski, A. (1996). Diatomeen der Baren-Insel Susswasser und marine Arten. In: Iconographia Diatomologica (H. Lange-Bertalot, ed.), Vol. 4, Koeltz Scientific Books, Konigstein, 287 pp.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Reimer, C.W. (1961). New and variable tax of the diatom genera Anomoneis Pfitz. and Stauroneis Her. (Bacillariophyta) from the United States. Proc. Acad. Nat. Sci. Philadelphia 113: 187-214.
Van de Vijver, B., Beyens, L. and Lange-Bertalot, H. (2004). The genus Stauroneis in Arctic and Antarctic Regions. Bibliotheca Diatomologica 50, 312 pp.
Stauroneis siberica has been found in several lakes and ponds in the Northern Rockies, including Glacier National Park and Waterton Lakes National Park. The pH of these waters ranges from 6.9 to 8.5 and specific conductance ranges from 30 to 130 µS/cm. Stauroneis siberica is a species of mountainous regions and higher latitudes in the Northern Hemisphere. It has also been recorded from Finland (Lange-Bertalot & Metzeltin 1996), the Tirolean Alps (Lange-Bertalot & Metzeltin 1996), Bear Island (Metzeltin & Witkowski 1996), Siberia (Lange-Bertalot & Genkal 1999), the High Arctic (Van de Vijver et al. (2004), the Eifel region of Germany (Lange-Bertalot & Metzeltin 1996), Iceland (Foged 1974), and from South Carolina (Reimer 1961).
Atlantic Pond, Glacier National Park, Montana: home of Stauroneis siberica.
Credit/Source: Loren Bahls