• Category
  • Length Range
    50-54 µm
  • Width Range
    3.3-3.8 µm
  • Striae in 10 µm
    13-14 in the center valve, 18-20 at the ends, areolae 40-44



The ventral margin is concave. The dorsal margin is convex and lacks a shoulder. The apices are slightly narrowed and rounded. The helictoglossae are not visible in the LM. The striae are distinctly oblique on the valve mantle and in the valve center, and become radiate near the apices.


To date, E. obliquestriata has been found epiphytic on bryophytes in a soil seep at a rock outcrop at the bottom of a dry water way along the Long Hungry Ridge Trail off the 20 – Mile Creek Trail in the Great Smoky Mountains National Park.

Original Description

Valves concave on the ventral margin, convex on the dorsal margin, with no shoulder, 50 – 54 μm long, 3.3 – 3.8 μm wide. Ends slightly narrowed and rounded. Helictoglossae not visible in light microscope. Rimoportula at one valve end. Striae distinctly oblique on valve mantle and in the valve center, 13 –14 in 10 µm, becoming radiate near the apices, 18 – 20 in 10 µm. Areolae 40 – 44 in 10 µm.

  • Author
    Furey, Lowe and Johansen 2011
  • Length Range
    50-54 µm
  • Width
    3.3-3.9 µm
  • Striae in 10µm
    13-14 in the center valve, 18-20 at the ends, areolae 40-44

Original Images

Eunotia obliquestriata orig illus
Eunotia Obliquestriata  Textscan

Cite This Page

Furey, P. (2011). Eunotia obliquestriata. In Diatoms of North America. Retrieved June 23, 2024, from https://diatoms.org/species/eunotia_obliquestriata


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