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Staurophora soodensis

(Krasske) L.L.Bahls 2013      Category: Symmetrical biraphid
BASIONYM: Navicula soodensis Krasske 1927
SYNONYM(S): Stauroneis soodensis (Krasske) Cholnoky 1962, p. 47 | Dickieia soodensis (Krasske) E.Reichardt 1997, p. 314, figs 60-71 
REPORTED AS: Stauroneis legleri (Hustedt 1959, p. 793, fig. 1138; Hustedt 1959, p. 418, figs 5-7) 

Staurophora columbiana


Staurophora tackei

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - June 2012
Length Range: 22-33 µm
Width Range: 4.4-8.8 µm
Striae in 10 µm: 16 (middle) to 20 (ends)


Valves are linear-lanceolate to elliptic-lanceolate, with bluntly rounded apices. Valves are strongly arched transapically; there is no distinct interface between the valve face and the mantle. The axial area is narrow. The central area is a narrow, and often slightly diagonal, transverse fascia. The raphe is filiform and straight, with proximal ends weakly expanded and bent to one side. The distal raphe fissures are hooked in the same direction. Striae are weakly radiate at valve center to parallel at the apices. The central fascia has one or two short striae at the valve margin. Areolae are very fine and difficult to resolve in LM.

Frustules may occur with “Janus valves”, two distinct morphologies within a single frustule. “Normal” valves are described above. Janus valves have a larger, more rounded central area than normal valves.

Original Description

Basionym: Navicula soodensis
Author: Krasske 1927
Length Range: 20-26 µm
Width Range: 5 µm
Striae in 10 µm: 18 at center valve, 20 near the ends

Original Description

Linear, nach den gerundeten Enden leicht verschmälert. In Gürtelansicht oft leicht Achnanthes-ähnlich gebogen. Ohne Längsarea, Zentralarea zu einer Querbinde verbreitert. Lang 20 - 26 µm, breit 5 µm. Streifen 18 in 10 µm, an den Enden etwas enger (20), leicht strahlend. Die Zentralarea neigt zu leicht unsymmetrischer Ausbildung (oft einseitig breiter).

Original Images

Cite This Page:
Bahls, L. (2012). Staurophora soodensis. In Diatoms of the United States. Retrieved May 24, 2018, from

Species: Staurophora soodensis

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Bahls, L. (2013). New diatoms (Bacillariophyta) from western North America. Phytotaxa 82(1): 7-28.

Cholnoky, B.J. (1962). Beiträge zur Kenntnis der Südafrikanischen Diatomeenflora. III. Diatomeen aus der Kaap-Provinz. Revista de Biologia 3: 1–80.

Cocquyt, C. (2004). Staurophora caljonii spec. nov. (Bacillariophyceae, Anomoeoneidaceae), a new halophilic diatom species from sub-recent lake deposits in Kenya. Hydrobiologia 511: 37-46.

Hustedt, F. (1959). Die Diatomeenflora des Salzlackengebietes im Österreichischen Burgenland. Österreichischen Akademie der Wissenschaften, Mathematische und Naturwissenschaftliche 168: 387–452.

Hustedt, F. (1959). Die Kieselalgen Deutschlands, Osterreichs und der Schweiz, 2. Teil. In: Kryptogamen-Flora von Deutschlands, Osterreichs und der Schweiz, (Dr. L. Rabenhorst, ed.), Band VII(2). Reprint 1977, Otto Koeltz Science Publishers, Koenigstein, 845 pp.

Krasske, G. (1927). Diatomeen deutscher Solquellen und Gradierwerke. Archiv für Hydrobiologie 18:252-272, pl. 10.

Lange-Bertalot, H., Kulbs, K., Lauser, T., Norpel-Schempp, M. and Willmann, M. (1996). Diatom taxa introduced by Georg Krasske: Documentation and revision. Iconographia Diatomologica (H. Lange-Bertalot, ed.), Vol. 3, Koeltz Scientific Books, Konigstein, 358 pp.

Reichardt, E. (1997). Morphologie und taxonomie wenig bekannter arten aus der sammelgattung Navicula (excl. Navicula sensu stricto). Diatom Research 12(2): 299-320.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Staurophora soodensis CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Staurophora soodensis has been recorded from White Lake in Sheridan County, Montana, and from the Powder River in Wyoming. In White Lake the pH measured 10.0 and specific conductance was 87000 µS/cm. Hustedt (1959) reported this species (as Stauroneis legleri) from a saline lake in the Austrian Alps.