• Category
  • Length Range
    25- 67 µm
  • Width Range
    9.5-13.0 µm
  • Striae in 10 µm



Larger valves are lanceolate-clavate, angular in outline, with only slightly protracted headpole and broadly rounded footpole. The axial area is narrow, broadening to form a small circular central area. The raphe is lateral and undulate. The striae are radiate, strongly so at the central portion of the valve. The striae are broad, biseriate, with individual areolae observable with oblique light in the light microscope. Longitudinal lines are distinct and positioned near the axial area. A single, distinct stigma is present in the central area.


Original Description

  • Basionym
    Gomphonema eriense
  • Author
    Grunow 1878

Cite This Page

Kociolek, P. (2011). Gomphoneis eriense. In Diatoms of North America. Retrieved June 19, 2024, from https://diatoms.org/species/gomphoneis_eriense


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