Diatoms of North AmericaDiatoms of North America

Eunotia canicula

Furey, Lowe and Johansen 2011

Eunotia Canicula Guide2
  • Category
    Eunotioid
  • Length Range
    20-35 µm
  • Width Range
    3.5-4.0 µm
  • Striae in 10 µm
    14-15, areolae >35

Identification

Eunotia canicula LM5 Eunotia canicula LM3 Eunotia canicula LM Eunotia canicula LM2 Eunotia canicula LM1 Eunotia canicula LM5 Eunotia canicula LM4
View image metadata Type

Description

Valves are straight to weakly concave on the ventral margin. The valve mantle is thickened at the proximal raphe ends. The dorsal margin is convex. The apices are acutely rounded, tapered, subrostrate, slightly delimited by a change in the slope of the dorsal margin, and appear nose-like. Each helictoglossa is equidistant from the midpoint of the apical axis and the apex. The helictoglossae are "set in" forming an indentation on the ventral margin. The distal raphe ends curve onto the valve surface. Striae are slightly radiate.

Autecology

To date Eunotia canicula has been found epiphytic on bryophyte substrates in streams throughout the Great Smoky Mountains National Park.

Gsm 7 29 05 1 F 0029
Credit: Paula C. Furey
Type locality: Noland Creek in the Noland Creek watershed. Great Smoky Mountains National Park, Swain County, North Carolina

Original Description

Valves straight to weakly concave on the ventral margin, with valve mantle thickened at the proximal raphe ends, convex on the dorsal margin, 20 – 35 μm long, 3.5 – 4.0 μm wide. Apices acutely rounded, tapered, subrostrate, slightly delimited by a change in the slope of the dorsal margin, appearing nose-like. Helictoglossae set in from ends, equidistant from each end, giving appearance of an indentation in the light microscope. Rimoportula at one end, at the center of the apex. Raphe with distal ends curved onto the valve surface. Striae slightly radiate, 14 – 15 in 10 μm. Puncta >35 in 10 μm.

  • Author
    Furey, Lowe and Johansen 2011
  • Length Range
    20-35 µm
  • Width
    3.5-4.0 µm
  • Striae in 10µm
    14-15, puncta >35

Original Images

Eunotia canicula orig illus
Eunotia Canicula Textscan

Cite This Page

Furey, P. (2011). Eunotia canicula. In Diatoms of North America. Retrieved April 19, 2024, from https://diatoms.org/species/eunotia_canicula

Responses

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