• Category
  • Length Range
    31-52 µm
  • Width Range
    7.6-10.6 µm
  • Striae in 10 µm
    28-32

Identification

Description

Valves are broadly lanceolate, with narrow subrostrate to apiculate apices. The stauros is narrow and rectangular. The raphe is lateral, with straight proximal ends that are weakly expanded. The distal raphe fissures are hooked in the same direction. Striae are weakly radiate near the valve center, becoming more strongly radiate towards the apices. Areolae are transapically elongated and irregularly spaced, 24-30 in 10 µm.

Autecology

Stauroneis boyntoniae is known only from the type locality, a lake high in the Wind River Range of Wyoming. Environmental data are not available for this lake.

Photo 2260  Lower  Twin  Lake
Credit: Beverly Boynton
Lower Twin Lake, Wind River Range, Sublette County, Wyoming: type locality of Stauroneis boyntoniae.

Original Description

Valves broadly lanceolate with narrow subrostrate to apiculate apices. Valve length 31–52 μm; valve width 7.6–10.6 μm. Axial area narrow. Stauros narrow but wider than the axial area, rectangular. Raphe lateral with straight, weakly expanded proximal ends. Striae weakly radiate near the valve center, more strongly radiate toward the apices, 28–32 in 10 μm. Areolae transapically oblong and irregularly spaced, 24–30 in 10 μm.

  • Author
    L.L.Bahls 2013
  • Length Range
    31-52 µm
  • Width
    7.6-10.6 µm
  • Striae in 10µm
    28-32

Original Images

Stauroneisboyntoniae Origimag002
Stauroneisboyntoniae Origdesc001

Cite This Page

Bahls, L. (2013). Stauroneis boyntoniae. In Diatoms of North America. Retrieved August 19, 2018, from https://diatoms.org/species/stauroneis_boyntoniae

Responses

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