• Category
  • Length Range
    36-38 µm
  • Width Range
    5.4-5.6 µm
  • Striae in 10 µm



Valves are linear with undulate sides that are constricted in the center. Apices are capitate to subcapitate. Axial area is narrow and the central area has a transverse fascia. Raphe is filiform and narrow with comma shaped terminal fissures. Striae are very slightly radiate or parallel in the center becoming convergent at the apices.


Original Description

  • Author
    E.E.Gaiser and J.Johansen 2000
  • Length Range
    38-41 µm
  • Width
    5-6 µm
  • Striae in 10µm

Original Images

Pinn bigibba org img
Pin bigibba org descp

Cite This Page

Aycock, L. (2022). Pinnularia bigibba. In Diatoms of North America. Retrieved April 21, 2024, from https://diatoms.org/species/pinnularia-bigibba


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