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Kobayasiella subtilissima

(Cleve) Lange-Bert. 1999      Category: Symmetrical biraphid
BASIONYM: Navicula subtilissima Cleve 1891
SYNONYM(S): Kobayasia subtilissima (Cleve) Lange-Bert. 1996 

Kobayasiella parasubtilissima


Krasskella kriegeriana

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - March 2012
Length Range: 23-27 µm
Width Range: 5.1-6.0 µm
Striae in 10 µm: 36-40, 30-36 in center


Valves are linear-lanceolate with convex sides and short, capitate apices. Apices are about one-half the width of the valve. Valve length-to-width ratio ranges from 4.0 to 4.7. The axial area is narrow and nearly linear. The central area is small and elliptical and bordered by alternately long and short striae. The raphe is filiform with a slight “kink” (SEM) about halfway to the apices. Proximal raphe ends are straight and slightly expanded. Distal raphe ends are strongly curved towards the secondary side, where Voigt discontinuities are evident in SEM. In LM, striae are easy to distinguish only in the central area. Striae are radiate, becoming convergent near the apices. Striae are composed of irregular series of dots and dashes which form jagged and faint longitudinal lines. The striae stop short of the valve mantle, where a hyaline line completely encircles the valve along the margins (SEM).

Original Description

Basionym: Navicula subtilissima
Author: Cleve 1891
Length Range: 32 µm
Width Range: 5 µm
Striae in 10 µm: 40-45

Original Description

Original Images

Cite This Page:
Bahls, L. (2012). Kobayasiella subtilissima. In Diatoms of the United States. Retrieved May 25, 2018, from

Species: Kobayasiella subtilissima

Contributor: Loren Bahls

Reviewer: Rex Lowe


Cleve, P.T. (1891). The Diatoms of Finland. Actas Societas Pro Fauna et Flora Fennica 8 (2): 1-68.

Kobayasi, H. and Nagumo, T. (1988). Examination of the type materials of Navicula subtilissima Cleve (Bacillariophyceae). The Botanical Magazine, Tokyo 101: 239-253.

Lange-Bertalot, H. (1996). Kobayasia bicuneus gen. et spec. nov. In: Iconographia Diatomologica, Annotated Diatom Micrographs (H. Lange-Bertalot, ed.), Vol. 4, pp. 277-287, Koeltz Scientific Books, Konigstein.

Lange-Bertalot, H. (1999). Kobayasiella nov. nom. ein neuer Gattungsname fur Kobayasia Lange-Bertalot 1996. In: Iconographia Diatomologica, Annotated Diatom Micrographs (H. Lange-Bertalot, ed.), Vol. 6, pp. 272-275, A.R.G. Gantner Verlag K.G., Vaduz.

Links & ID's

Index Nominum Algarum (INA)

Transfer INA

California Academy of Sciences (CAS)

Kobayasiella subtilissima CAS

North American Diatom Ecological Database (NADED)

NADED ID: 199001

Autecology Discussion

Navicula subtilissima was described by Cleve from material collected in Lake Imandra, Russian Lapland, at approximately 68 degrees north latitude. Fallu et al. (2000) reported this taxon from lakes in northern Québec and Labrador. In the United States, Stoermer et al. (1999) reported Kobayasiella subtilissima (as Kobayasia subtilissima) from the Great Lakes. We have six records for this species in the Montana Diatom Collection, from California, Idaho, Montana, and Wyoming. One of these records is for Drosera Pond on the Indian Meadows Research Natural Area, Helena National Forest, Montana, where it occurs in association with K.micropunctata, K. okadae, and K. parasubtilissima. Here the pH measures 8.46 and specific conductance measures 19 µS/cm.


Collecting diatoms from Sphagnum moss at Drosera Pond, Indian Meadows Research Natural Area, Helena National Forest, Montana. Drosera Pond is home to Kobayasiella subtilissima and three other spcecies in this genus.

Credit/Source: John Pierce

EMAP Assessment

The Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Over 1200 streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.

EMAP Distribution

Kobayasiella subtilissima

EMAP Response Plots

Kobayasiella subtilissima

EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.