Eunotia tenella
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Category
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Length Range11-33 µm
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Width Range2.6-3.7 µm
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Striae in 10 µm16-22
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SynonymsEunotia exigua var. tenella (Grunow) Nörpel and Alles in Alles, Nörpel and Lange-Bert. 1991
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ContributorPaula Furey - Mar 2012
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ReviewerMarina Potapova - Apr 2012
Identification
Description
Ventral margin is slightly concave. Dorsal margin is parallel in longer specimens to more convex in smaller specimens. Apices are broadly rounded to truncate. Helictoglossae are positioned close to the apices. Distal raphe ends curve slightly on to the valve face. Areolae are not visible in the LM. One apical rimoportula is positioned mid-way up valve apex.
Original Description
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BasionymEunotia arcus var.? tenella
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AuthorGrunow in Van Heurck 1881
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 33060
Cite This Page
Furey, P. (2012). Eunotia tenella. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/47961/eunotia_tenella
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eunotia tenella 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.
Eunotia tenella
- Ventral margin concave
- Dorsal margin parallel
- Apices broadly rounded to truncate
- Helictoglossae close to apices
- Distal raphe curves onto valve face
Ventral margin is slightly concave. Dorsal margin is parallel in longer specimens to more convex in smaller specimens. Apices are broadly rounded to truncate. Helictoglossae are positioned close to the apices. Distal raphe ends curve slightly on to the valve face.