• Category
  • Length Range
    25-40 µm
  • Width Range
    7.3-11.4 µm
  • Striae in 10 µm
    24-30

Identification

Description

Valves are elliptical to elliptic-lanceolate with short protracted and broadly rounded apices. The axial area is narrow, barely wider than the raphe. The central area is a transverse rectangular fascia of variable width, often with one or more short striae at each margin. The raphe is filiform with nearly straight and somewhat expanded proximal ends. Terminal raphe fissures are hooked, the hooks opening towards the secondary side of the valve. Striae are nearly parallel in the middle and weakly radiate throughout the remainder of the valve. Striae near the center of the valve are more widely spaced than those towards the apices. Areolae in the striae are very fine and difficult to resolve in LM.

Autecology

There are 15 records for Staurophora wislouchii in the Montana Diatom Collection, all of them from streams on the Northwestern Great Plains in eastern Montana. The mean pH of these waters is 8.2 and the mean conductivity is 1975 µS/cm. Common diatom associates of Staurophora wislouchii in these waters are Hantzschia distinctepunctata, Parlibellus crucicula, Craticula ambigua, Fallacia omissa, Nitzschia siliqua, Planothidium hauckianum, Gyrosigma macrum, and Navicula germainii. Staurophora wislouchii was described from mineral springs of the Kurortes Staraja Russa south of Leningrad (Poretzky & Anisimova 1933). Hustedt (1959) reports this species from saline waters of interior eastern Europe and central Asia.

Musselshell  River At  Mosby
Credit: Loren Bahls
Musselshell River at Mosby Montana: home of Staurophora wislouchii.

Original Description

  • Basionym
    Stauroneis wislouchii
  • Author
    Poretzky and Anisimova 1933

Original Images

Stauroneis Wislouchii  Ill
Stauroneis Wislouchii  Descr

Cite This Page

Bahls, L. (2012). Staurophora wislouchii. In Diatoms of North America. Retrieved August 15, 2018, from https://diatoms.org/species/staurophora_wislouchii

Responses

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