• Category
  • Length Range
    8-19 µm
  • Width Range
    5-8 µm
  • Striae in 10 µm
    Fibulae 8-10



The small, heteropolar valves are 8-19 μm in length by 5-8 μm in width. The headpole is broadly rounded while the footpole is cuneately rounded. The fibulae are broad and short with 8-10 in 10 μm. The costae and central line are not visible in the LM.


Original Description

Valves oval with distinct alae, about 12 µ long, 6 µ broad. Alar canals about 6 in 10 µ, cell wall very slightly undulate in the marginal zone only. Structure very delicate and inconspicuous.

  • Author
    Hust. 1955
  • Length Range
    12 µm
  • Width
    6 µm

Original Images

New Sp Card005Edit2
Hustedt Type002
New Sp Card005Edit1

Cite This Page

English, J. (2011). Surirella atomus. In Diatoms of North America. Retrieved April 21, 2024, from https://diatoms.org/species/surirella_atomus


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