Diatoms of North AmericaDiatoms of North America

Eunotia montuosa

Furey, Lowe and Johansen 2011

Eunotia Montuosa Guide
  • Category
    Eunotioid
  • Length Range
    31-59 µm
  • Width Range
    7-13 µm
  • Striae in 10 µm
    7-9 in the center valve, 10-14 at the ends

Identification

Eunotia montuosa LM2 Eunotia montuosa LM3 Eunotia montuosa LM4 Eunotia montuosa LM1 Eunotia montuosa LM5 Eunotia montuosa LM6 Eunotia montuosa LM7
View image metadata
Eunotia montuosa SEM1 Eunotia montuosa SEM4 Eunotia montuosa SEM2 Eunotia montuosa SEM3

Description

The ventral margin is slightly concave with subapical swellings at the proximal raphe ends. The dorsal margin is strongly biundulate with acutely pointed peaks. The valve apices are constricted, dorsally recurved and apically flattened. Helictoglossae are not visible in the LM. One apical rimoportula is positioned at the center of the apex (visible in SEM). The distal ends of the raphe are slightly curved and clearly visible in the LM. Striae are radiate. Short, radiate striae are present distally to the distal raphe ends. Aerolae within a stria number 24-28 in 10 µm.

Autecology

To date, Eunotia montuosa has been found in low abundance in epilithic samples from Hen Wallow Falls and in brown slime on a wet wall at the edge of Meigs Falls in the Great Smoky Mountains National Park.

Original Description

Valves slightly concave with subapical swellings on the ventral margin, strongly biundulate with acutely pointed peaks on the dorsal margin, 31 – 59 μm long, 7 – 13 μm wide. Ends attenuated, constricted, dorsally recurved, truncated and apically flattened. Helictoglossae not visible in the light microscope. Rimoportula at one end of valve, at the center of the apex. Raphe with distal ends slightly curved and clearly visible in the light microscope. Striae radiate, with abbreviated radial striae at the apices after the last transverse stria, 7 – 9 in 10 μm in the valve center, 10 – 14 in 10 μm near the valve apices. Puncta 24-28 in 10 μm.

  • Author
    Furey, Lowe and Johansen 2011
  • Length Range
    31-59 µm
  • Width
    7-13 µm
  • Striae in 10µm
    7-9 in the center valve, 10-14 at the ends, puncta 24-28

Original Images

Eunotia montuosa orig illus
Eunotia Montuosa Textscan

Cite This Page

Furey, P. (2011). Eunotia montuosa. In Diatoms of North America. Retrieved April 26, 2024, from https://diatoms.org/species/eunotia_montuosa

Responses

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