• Category
  • Length Range
    29-32 µm
  • Width Range
    5.8-6.6 µm
  • Striae in 10 µm
    30-35 in the center, >40 at the ends
  • Reported As
    Navicula jaagii (Krammer and Lange-Bertalot 1986, pg 185, Figs 18-21)



Valves are fusiform with short protracted and broadly rounded apices. The axial area is narrow. The central area is transversely rectangular with rounded but irregular borders. The raphe is filiform and straight. Proximal raphe ends are somewhat inflated. Distal raphe ends are bent in the same direction. Striae are radiate and more widely spaced near the valve center.


Kobayasiella jaagii was collected among submerged vegetation in Lake Winona in Glacier National Park, Montana. Here the pH was measured at 7.2 and specific conductance was 250 µS/cm. Krammer and Lange-Bertalot (1986) report this taxon as a northern-alpine species in oligotrophic flowing and standing waters.

P9230531 1
Credit: Billy Schweiger, National Park Service.
Lake Winona, Glacier National Park, Montana.

Original Description

  • Basionym
    Navicula jaagii
  • Author
    F.Meister 1934

Original Images

N Jaagi Orig Illus
N Jaagi Orig Des

Cite This Page

Bahls, L. (2012). Kobayasiella jaagii. In Diatoms of North America. Retrieved May 28, 2024, from https://diatoms.org/species/kobayasiella_jaagii


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Kobayasiella jaagii 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.