• Category
  • Length Range
    7-15 µm
  • Width Range
    3.6-5.3 µm
  • Striae in 10 µm



Valves are elliptical to linear-elliptical. The raphe valve has a lanceolate axial area and no distinct central area. The raphe is straight without terminal fissures. External proximal and distal raphe endings are slightly expanded. Striae in the middle of raphe valve are almost parallel, becoming radiate toward apices, 18-20 in 10 µm. The rapheless valve has a linear axial area and no central area. Striae on rapheless valve are interrupted by a longitudinal line at each side of the valve, they are slightly radiate or almost parallel in the valve center, becoming radiate toward apices, 18-20 in 10 µm. The vimines dividing areolae within striae on both raphe and rapheles valves are often incomplete, so that areolae are often partially fused. They are arranged in either uniseriate or biseriate striae, which are formed by offset double rows of areolae. The double rows are more often observed towards the valve margins.

Original Description

Schalen elliptisch mit breit gerundeten Enden, 8-11 µ lang, 3,5-4,5 breit. Raphenlose Schalen mit leicht radialen Transpicalstreifen, etwa 22 in 10 µ, beiderseits der Mittellinie durch eine schmale, hyaline Furche (Längsrippe) unterbrochen; Pseudoraphe sehr eng, linear. Raphenschen mit gerader, faden förmiger Raphe; Axialarea sehr eng, um den Mittelknoten nicht merklich erweitert; Transapikalstreifen ebenfalls leicht radial, 22 in 10 µ, ohne Längsfurche (Fig. 859B).

  • Basionym
    Achnanthes suchlandtii
  • Author
    Hust. 1933
  • Length Range
    8-11 µm
  • Width
    3.5-4.5 µm
  • Striae in 10µm
    22 in the center of the raphe valve

Original Images

Achnanthes suchlandtii orig illus
Achnanthes suchlandtii orig descr

EMAP Assessment

EMAP Distribution

Karayevia Suchlandtii 10 Copy
Map 10

Response Plots

Karayevia Suchlandti Copy

Cite This Page

Potapova, M. (2010). Karayevia suchlandtii. In Diatoms of North America. Retrieved July 16, 2018, from https://diatoms.org/species/karayevia_suchlandtii


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