• Category
  • Length Range
    9-16 µm
  • Width Range
    6-8 µm
  • Striae in 10 µm



Valves are elliptical with narrowly capitate to subcapitate apices. The raphe valve has a lanceolate axial area and no distinct central area. The raphe is straight, without terminal fissures. The proximal raphe ends are simple externally. The proximal raphe ends curve toward opposite sides internally. Striae on raphe valve are radiate, in the valve center short and long striae alternate, 14-18 in 10 µm. Each stria represents a single transapically elongated areola. The rapheless valve has a linear axial area and no central area. Striae on rapheless valve are punctate, parallel in the center and slightly radiate at apices, 14-18 in 10 µm. The openings of the areolae are transapically elliptical.

Original Description

Schalen mit breit elliptischem Mittelteil, vor den Polen ziemlich plötzlich und stark verschmälert, mit auffällig breit vorgezogenen, an den Polen flach gestutzten Enden, 12—16 μ lang, 6—8 μ breit. Raphenlose Schalen mit sehr schmal lanzettlicher Pseudoraphe, ohne Zentralarea; Transapikalstreifen etwa 16 in 10 μ, leicht radial, deutlich punktiert, Punkte etwa 28 in 10 μ. Raphen-schale mit fadenförmiger Raphe, Axialarea eng, gegen die Mitte kaum erweitert, ohne Zentralarea; Transapikalstreifen nur wenig zarter, etwa 18 in 10 μ, ebenfalls radial, am Rande oft kurze Streifen eingeschoben, Punktierung zarter als auf der anderen Schale

  • Basionym
    Achnanthes laterostrata
  • Author
    Hust. 1933
  • Length Range
    12-16 µm
  • Width
    6-8 µm
  • Striae in 10µm
    16 in 10 μm in RL valve, 18 in 10 μm in R valve

Original Images

Karlater  Orig Ill
Karlater  Orig Descr

Cite This Page

Potapova, M. (2010). Karayevia laterostrata. In Diatoms of North America. Retrieved June 13, 2024, from https://diatoms.org/species/karayevia_laterostrata


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