Krasskella kriegeriana

R.Ross and P.A.Sims 1978      Category: Symmetrical biraphid
BASIONYM: Fragilaria kriegeriana Krasske 1943
SYNONYM(S): Amphipleura kriegeriana (Krasske) Hust. 1954 

Kobayasiella subtilissima


Kurtkrammeria aequalis

LM scalebar = 10 µm = 80 pixels.


Contributor: Sarah Spaulding | Ian Bishop - September 2014
Length Range: 13-15 µm
Width Range: 1.2-1.6 µm
Striae in 10 µm: 25-26


Valves are linear, with subcapitate to capitate apices. Valves are small and lightly silicified. The axial area is linear and narrow. The proximal raphe ends are distantly placed. In light microscopy, the proximal raphe ends are distinctly thickened. Striae are parallel in the center of the valve, and slightly convergent near the apices. Each stria is composed of a single elongate areola. In girdle view, frustules are narrow, nearly rectangular and the thickened proximal raphe ends are clearly visible.

This small, rare taxon has likely been overlooked or included with species of Achnanthidium, or perhaps Berkeleya rutilans in surveys of North American rivers.

Original Description

Basionym: Fragilaria kriegeriana
Author: Krasske 1943
Length Range: 13 µm
Width Range: 1.5-1.8 µm
Striae in 10 µm: 30

Original Description

Original Images

Cite This Page:
Spaulding, S., and Bishop, I. (2014). Krasskella kriegeriana. In Diatoms of the United States. Retrieved April 20, 2018, from

Species: Krasskella kriegeriana

Contributor: Sarah Spaulding | Ian Bishop

Reviewer: Mark Edlund


Camburn, K.E. and Charles, D.F. (2000). Diatoms of Low-Alkalinity Lakes in the Northeastern United States. Academy of Natural Sciences of Philadelphia, Special Publication 18, 152 pp.

Camburn, K.E., Kingston, J.C. and Charles, D.F. (1986). PIRLA Diatom Iconograph. PIRLA Unpublished Report Series, Report 3. - Electric Power Research Institute, Palo Alto, California.

Fallu, M.-A., Allaire, N. and Peinitz, R. (2000). Freshwater diatoms from northern Québec and Labrador (Canada). Species-environment relationships in lakes of boreal forest, forest-tundra and tundra regions. Bibliotheca Diatomologica 45: 1-200.

Hustedt, F. (1954). Neue und wenig bekannte Diatomeen. VI. Berichte der Deutschen Botanishen Gesellschaft 67: 269-280.

Krasske, G. (1943). Zur Diatomeenflora Lapplands. Bericht der Deutschen Botanischen Gessellschaft 61(3): 81-88.

Ross, R. and Sims, P.A. (1978). Notes on some diatoms from the Isle of Mull, and other Scottish localities. Bacillaria 1:151-168.

Rumrich, U., Lange-Bertalot, H. and Rumrich, M. (2000). Diatoms of the Andes. From Venezuela to Patagonia/Tierra del Fuego and two additional contributions. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 9. Phytogeography-Diversity-Taxonomy. Koeltz Scientific Books, Königstein, Germany, 9:673 pp.

Siver, P.A., Hamilton, P.B., Stachura-Suchoples, K. and Kociolek, J.P. (2005). Diatoms of North America. The Freshwater Flora of Cape Cod. Iconographia Diatomologica 14: 1-463.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Krasskella kriegeriana CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Krasskella kriegeriana has been found as rare taxon in Higgins Pond, Cape Cod, Massachusetts (Siver et al. 2005). It was also reported from South American glacial rivers (Rumrich et al. 2000), although the specimens do not conform to the type as described by Krasske (1943). In North America, K. kriegeriana is not uncommon in cold, nutrient poor rivers of the California Sierra Nevada Range. This taxon is also reported and illustrated from Michigan (Camburn and Charles 2000) and Fallu et al. (2000) from Quebec, reported as Amphipleura kriegeriana. Fallu et al, provides DOC optima (p 45). This taxon is included in the PIRLA Iconograph (Contrib 12, Pl 49, FIg 221) from Mud Pond, Maine with dimensions 12.5 µm in length, 1.5 µm in width and striae count of 28 in 10 µm.