Eunotia trinacria
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Category
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Length Range8-24 µm
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Width Range1.7-2.6 µm
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Striae in 10 µm17-23 in the center valve
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SynonymsEunotia paludosa var. trinacria (Krasske) Nörpel and Alles in Alles et al. 1991
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ContributorPaula Furey - Mar 2012
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ReviewerMarina Potapova - Apr 2012
Identification
Description
Valves are elongate-triangular, becoming more linear in larger specimens. Ventral margins are straight to weakly concave. Dorsal margins are slightly convex, with a slight central undulation. Valve ends are weakly subcapitate, subrostrate and not set off, or only slightly set off, from the main part of the valve. Helitoglossae are located close to the apices. Striae are parallel. The areolae are unresolved in the LM. Frustules are rectangular in girdle view.
Autecology
Found in streams, wetwalls, waterfalls, and sink holes, often associated with bryophytes.
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Size Range, µm3
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Motility
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Habitat
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Waterbody
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Original Description
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AuthorKrasske 1929
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Length Range4-10 µm
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Width2-4 µm
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Striae in 10µm17-22
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 33212
Cite This Page
Furey, P. (2012). Eunotia trinacria. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/48366/eunotia_trinacria
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eunotia trinacria 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 trinacria
- Valves elongate triangular
- Ventral margin straight to weakly concave
- Dorsal margin with slight central undulation
Valves are elongate-triangular, becoming more linear in larger specimens. Ventral margins are straight to weakly concave. Dorsal margins are slightly convex, with a slight central undulation. Valve ends are weakly subcapitate, subrostrate and not off, or only slightly set off, from the main part of the valve.