• Category
  • Length Range
    11-33 µm
  • Width Range
    2.6-3.7 µm
  • Striae in 10 µm
  • Synonyms
    Eunotia exigua var. tenella (Grunow) Nörpel and Alles in Alles, Nörpel and Lange-Bert. 1991



Ventral margin is slightly concave. Dorsal margin is parallel in longer specimens to more convex in smaller specimens. Apices are broadly rounded to truncate. Helictoglossae are positioned close to the apices. Distal raphe ends curve slightly on to the valve face. Areolae are not visible in the LM. One apical rimoportula is positioned mid-way up valve apex.

Original Description

  • Basionym
    Eunotia arcus var.? tenella
  • Author
    Grunow in Van Heurck 1881

Original Images

Eunotia tenella orig illus

Cite This Page

Furey, P. (2012). Eunotia tenella. In Diatoms of North America. Retrieved June 21, 2024, from https://diatoms.org/species/eunotia_tenella


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