• Category
  • Length Range
    42-180 µm
  • Width Range
    2.5-3.5 µm
  • Striae in 10 µm
    14-17 in the center, 16-22 at the ends



Valves moderately arched. The ventral margin is concave, while the dorsal margin is convex. Valves become progressively narrower toward the apices. Helictoglossae are located close to the apices. The apices are slightly inflated and slightly recurved toward the dorsal margin. The distal raphe end curves on to the valve face, then bends 180º and continues a short distance toward the proximal raphe ends. This raphe curvature is visible in the LM. The areolae are unresolved in the LM. Aberrations may occur in the valves, often in the form of a protuberance or bump on the ventral margin.

Original Description

  • Author
    Mig. 1907
  • Length Range
    40-75 µm
  • Striae in 10µm

Original Images

Eunotia Naegelii  Orig Descr

Cite This Page

Furey, P. (2012). Eunotia naegelii. In Diatoms of North America. Retrieved June 17, 2024, from https://diatoms.org/species/eunotia_naegelii


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