• Category
  • Length Range
    26-29 µm
  • Width Range
    5.2-5.8 µm
  • Striae in 10 µm
  • Reported As
    Navicula species 3 (Krammer and Lange-Bertalot 1986, Fig. 38: 21)
    Navicula seibigii (Krammer and Lange-Bertalot 1991 & 2004, Fig. 63: 1-6)



Valves are lanceolate with slightly protracted, broadly rounded apices. The axial area is narrow and linear. The central area is small and bordered on each side by one or two short striae. The raphe is filiform with inflated proximal ends. Striae are robust, strongly radiate in the middle, becoming abruptly parallel then convergent near the ends. Areolae are fine and number 34-38 in 10 µm.


Navicula seibigiana has been recorded from 55 ponds and small streams in the Pacific Northwest, where it is present in small numbers. In these waters mean water temperature was 9.3 degrees C, mean pH 7.6, and mean specific conductance 120 µS/cm.

Blakiston  Beaver  Pond  A 1
Credit: Barb Johnston, Parks Canada.
Blakiston Beaver Pond A, Waterton Lakes National Park, Alberta: home of Navicula seibigiana.

Original Description

Valves elliptic-lanceolate to linear-lanceolate, ends often slightly protracted for a short distance, very obtusely to almost broadly rounded, length 25-35 µm, breadth 5.5-6.5 µm. Raphe branches filiform with very distinct central pores. Axial area narrow, linear, central area irregularly bordered on both sides due to the shortening of one or two striae, almost rectangular, only slightly enlarged. Striae fairly strongly radiate in the middle, then abruptly parallel, becoming convergent, 9-11/10 µm; lineolae c. 36/10 µm.

  • Author
    Lange-Bert. 1993
  • Length Range
    25-35 µm
  • Width
    5.5-6.5 µm
  • Striae in 10µm

Original Images

Navseibig Origimag
Navseibig Origdesc

Cite This Page

Bahls, L. (2012). Navicula seibigiana. In Diatoms of North America. Retrieved July 15, 2024, from https://diatoms.org/species/navicula_seibigiana


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