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Stauroneis heinii

Lange-Bert. and Krammer 1999      Category: Symmetrical biraphid

REPORTED AS: Stauroneis phoenicenteron (Hein 1990) 

Stauroneis gracilis


Stauroneis kingstonii

LM scalebar = 10 µm = 20 pixels.


Contributor: Loren Bahls - December 2011
Length Range: 116-191 µm
Width Range: 22-36 µm
Striae in 10 µm: 15-17


Valves are lanceolate with short, subrostrate, and broadly rounded apices. The axial area is about three times wider than the raphe. The central area is a stauros, somewhat wider toward valve margins and occasionally containing short marginal striae. External raphe fissures are lateral. Proximal raphe endings are somewhat inflated and curved to the secondary side. Terminal raphe fissures are hooked, the hooks opening towards the secondary side. Striae are radiate throughout, more so near the apices. Areolae are distinct and number 15-18 in 10 µm.

Original Description

Author: Lange-Bert. and Krammer 1999
Length Range: 125-200 µm
Width Range: 22-29 µm
Striae in 10 µm: 15-18

Original Description

Valvae stricte lanceolatae apicibus minime curte protractis et late rotundatis, 125-200 µm, 22-29 µm latae. Fissurae raphis conspicue laterales sitae inter se extremis centralibus distincte reverse-lateralibus poris centralibus unilateraliter declinatis. Area axialis satis lata ad mediam versus sensim dilatata. Area centralis fasciam formans fere anguste rectangulatam sive ad margines paulo dilatatam. Striae transapicales modice radiantes in media parte magis in partibus distalibus, 15-18 in 10 µm. Puncta striarum 16-18 in 10 µm.

Original Images

Cite This Page:
Bahls, L. (2011). Stauroneis heinii. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Stauroneis heinii

Contributor: Loren Bahls

Reviewer: Mark Edlund


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.

Hein, M. (1990). Flora of Adak Island, Alaska: Bacillariophyceae (Diatoms). Bibliotheca Diatomologica (H. Lange-Bertalot, ed.), Band 21, J. Cramer, Berlin, 133 pp.+ 53 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.

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 heinii CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Stauroneis heinii is widely distributed in ponds, small lakes, and wetlands at lower elevations in the Northern Rockies. Available water quality data suggest that this taxon has a relatively broad ecological amplitude, with pH ranging from 5.5 to 8.5 (mean = 6.5) and specific conductance ranging from 8 to 257 µS/cm (mean = 74 µS/cm). Hein (1990) reported this taxon (as S. phoenicenteron) from Adak Island, Alaska.


Lower Howe Lake, Glacier National Park, Montana: home of Stauroneis heinii.

Credit/Source: Steven Rapelje