Stauroneis americana

Heiden in Schmidt et al. 1903      Category: Symmetrical biraphid

REPORTED AS: Stauroneis javanica (Hustedt 1959) 

Stauroneis akamina


Stauroneis amphicephala

LM scalebar = 10 µm = 20 pixels.


Contributor: Loren Bahls - November 2011
Length Range: 136-214 µm
Width Range: 32-46 µm
Striae in 10 µm: 11-14


Valves are broadly lanceolate with bluntly rounded apices. A prominent pseudoseptum is present at each apex. The axial area is broad and linear, about three times the width of the raphe. The central area is a rectangular stauros, about the same width as the axial area, widening very slightly near the valve margin. The raphe is lateral, becoming filiform near the central area. The proximal raphe ends are nearly straight and weakly expanded. Striae are slightly radiate throughout. Areolae are coarse and number 9-14 in 10 µm.

Original Description

Author: Heiden in A.Schmidt et al. 1903
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bahls, L. (2011). Stauroneis americana. In Diatoms of the United States. Retrieved April 22, 2018, from

Species: Stauroneis americana

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


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.

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.

Schmidt, A. (-). (1874-1959). Atlas der Diatomaceen-Kunde, von Adolf Schmidt, continued by Martin Schmidt, Friedrich Fricke, Heinrich Heiden, Otto Muller, Friedrich Hustedt. Reprint 1984, Koeltz Scientific Books, Konigstein, 480 plates.

Van de Vijver, B., Beyens, L. and Lange-Bertalot, H. (2004). The genus Stauroneis in Arctic and Antarctic Regions. Bibliotheca Diatomologica 50, 312 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Stauroneis americana CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Stauroneis americana is widely distributed in wetlands with alkaline pH and low to moderate conductivity, but it is rarely found in abundance. Van de Vijver et al. (2004) published a photo of a Stauroneis americana specimen from Yellowstone National Park (plate 91, fig. 2) and Lange-Bertalot & Genkal (1999) pictured a specimen from “the Rocky Mountains, North America” (Tafel 35, fig. 2).


Bloody Dick Pond #5, Beaverhead County, Montana: Home of Stauroneis americana.

Credit/Source: Loren Bahls