• Category
  • Length Range
    10-28 µm
  • Width Range
    5.0-8.2 µm
  • Striae in 10 µm
    9-12 on rapheless valve, 18-24 on raphe valve



Valves are lanceolate with rounded to subrostrate apices. The raphe valve has a narrowly lanceolate axial area and no distinct central area. The raphe is straight, with terminal fissures deflected to the same side. The proximal raphe ends are slightly expanded externally. The proximal raphe ends are deflected toward opposite sides internally. Striae on raphe valve are radiate, 18-24 in 10 µm. Shortened marginal striae are often present in the middle part of the raphe valve. The areolae openings are transapical slits. The rapheless valve has a narrow linear axial area and no central area. Striae on rapheless valve are coarsely punctate, parallel in the center and slightly radiate at apices, 9-12 in 10 µm. The openings of the areolae are transapically elliptical.

Original Description

Klein, Schaalen breit lanzettlich mit stumpf vorgezogenen En-den. Querstreifen radial, in der Unterschaale 18—24, in der Oberschaale 9—11 in 0,01 mm., stark punktirt.

  • Basionym
    Achnanthes clevei
  • Author
    Grunow in Cleve and Grunow 1880
  • Striae in 10µm
    18-24 on raphe valve, 9-11 on rapheless valve

Original Images

Orig Ill  A Clevei
Karclev  Orig Desc

Cite This Page

Potapova, M. (2010). Karayevia clevei. In Diatoms of North America. Retrieved May 28, 2024, from https://diatoms.org/species/karayevia_clevei


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