• Category
  • Length Range
    19-23 µm
  • Width Range
    3.5-4.3 µm
  • Striae in 10 µm
    difficult to resolve in LM
  • Synonyms
    Kobayasia micropunctata (H.Germ.) Lange-Bert. 1996
    Navicula micropunctata (H.Germ.) H.Kobayasi and Nagumo 1988
  • Reported As
    Navicula subtilissima (Hustedt 1961-1966, p. 89, fig. 1235)



Valves are linear-lanceolate with convex sides and capitate apices. Length-to-width ratio ranges from 4.9 to 6.0. The raphe is filiform and straight. Proximal raphe ends are distinctly 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 are difficult to resolve in LM, except near the central area, where they are radiate and more widely spaced.


Kobayasiella micropunctata has been reported from two floating-mat fens in northwestern Montana. In one of these fens (Drosera Pond), pH was 8.46 and specific conductance was 19 µS/cm. Here it is found with K. okadae, K. parasubtilissima, and K. subtilissima. Kobayasi & Nagumo (1988) report this taxon from a pond in Japan with a pH of 6.8 and specific conductance of 131 µS/cm.

Mud  Lake  Bob  Marshall  Wilderness 1
Credit: John Pierce
Mud Lake, Bob Marshall Wilderness, Flathead National Forest, Montana.

Original Description

  • Basionym
    Navicula subtilissima var. micropunctata
  • Author
    H.Germ. 1981

Original Images

Nsubtilissima Micropunctata  Ill1
Nsubtilissima Micropunctata  Ill2
Nsubtilissima Micropunctata  Descr

Cite This Page

Bahls, L. (2012). Kobayasiella micropunctata. In Diatoms of North America. Retrieved April 21, 2024, from https://diatoms.org/species/kobayasiella_micropunctata


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Kobayasiella micropunctata from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.