Kobayasiella parasubtilissima

(H.Kobayasi and Nagumo) Lange-Bert. 1999      Category: Symmetrical biraphid
BASIONYM: Navicula parasubtilissima H.Kobayasi and Nagumo 1988
SYNONYM(S): Kobayasia parasubtilissima (H.Kobayasi and Nagumo) Lange-Bert. 1996 
REPORTED AS: Navicula subtilissima (Kramer and Lange-Bertalot 1986, pg. 182, Fig. 79: 22-26) | Navicula parasubtilissima (Camburn and Charles 2000, pg. 24, plate 34, fig. 5) 

Kobayasiella okadae


Kobayasiella subtilissima

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - March 2012
Length Range: 25-42 µm
Width Range: 4.0-4.7 µm
Striae in 10 µm: cannot be resolved in LM


Valves are linear-lanceolate with convex margins and short, capitate apices. Length-to-width ratio ranges from 6.0 to 9.3. The raphe is filiform and straight. Proximal raphe ends are weakly expanded. Distal raphe ends are bent in the same direction. The axial area is narrow. The central area is elliptic and barely wider than the axial area. Individual striae difficult to resolve in LM but appear to be more radiate at the valve center.

Original Description

Basionym: Navicula parasubtilissima
Author: H.Kobayasi and Nagumo 1988
Length Range: 22-34 µm
Width Range: 3.5-4.5 µm
Striae in 10 µm: 40-44

Original Description

Valves linear-lanceolate with slightly convex margin and capitate ends, 22-34 µm long, 3.5-4.5 µm broad. Raphe straight. Axial area narrow, central area small and circular. Transapical striae strongly radiate, alternately longer and shorter in the middle, strongly convergent at the ends, 40-44 in 10 µm.

Original Images

Cite This Page:
Bahls, L. (2012). Kobayasiella parasubtilissima. In Diatoms of the United States. Retrieved April 20, 2018, from http://westerndiatoms.colorado.edu/taxa/species/kobayasiella_parasubtilissima

Species: Kobayasiella parasubtilissima

Contributor: Loren Bahls

Reviewer: Rex Lowe


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.

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

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

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 parasubtilissima CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Kobayasiella parasubtilissima occurs in four weakly acid to somewhat alkaline fens in the Northern Rocky Mountains, where the pH range is 5.50 to 8.46 and the specific conductance range is 19 to 257 µS/cm. At Drosera Pond on the Indian Meadows Research Natural Area in Montana, K. parasubtilissima is found in association with K. okadae, K. micropunctata, and K. subtilissima.


Drosera Pond on the Indian Meadows Research Natural Area, Helena National Forest, Montana. Drosera Pond is a floating-mat fen with a central pool of open water. Besides four species of Kobayasiella and several other rare diatom taxa, Drosera Pond supports three imperiled species of vascular plants.

Credit/Source: Loren Bahls