Eunotia microcephala
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Category
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Length Range13-16 µm
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Width Range1.9-2.1 µm
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Striae in 10 µm18-22 in the center valve
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ContributorPaula Furey - Mar 2012
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ReviewerMarina Potapova - Apr 2012
Identification
Description
Frustules are narrow and rectangular in girdle view. Ventral margins are weakly concave, with two slight swellings marking the position of the proximal raphe ends. Dorsal margins are irregular and weakly triundulate, with the central undulation most prominent. Valve ends are protracted and capitate to subcapitate. Helitoglossae are located close to the apices. The raphe extends in a short curve on to the valve face. Striae are parallel. The areolae are unresolved in the LM. One apical rimoportula is located just above the center of the apex.
Original Description
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AuthorKrasske 1932
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Length Range10-15 µm
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Width2-3 µm
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Striae in 10µm18-22
Original Images
Citations & Links
Citations
Links
Cite This Page
Furey, P. (2012). Eunotia microcephala. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/47981/eunotia_microcephala
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eunotia microcephala 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 microcephala
- Ventral margin weakly concave
- Dorsal margin with central undulation
- Apices capitate to subcapitate
Ventral margins are weakly concave, with two slight swellings marking the position of the proximal raphe ends. Dorsal margins are irregular andly weakly triundulate, with the central undulation being most prominent. Valve ends are protracted and capitate to subcapitate. Helictoglossae are located close to the apices. The raphe extends in...