Platessa strelnikovae
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Category
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Length Range11-19 µm
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Width Range6-7 µm
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Striae in 10 µm14-17
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ContributorMarina Potapova - Dec 2014
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ReviewerSarah Spaulding - Dec 2024
Identification
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Type
Description
Valves are broadly elliptic with rounded, sometimes slightly protracted apices. The raphe valve is concave and the rapheless valve is convex. The raphe valve has a narrow, straight axial area, widening towards a rhomboid central area. The raphe is straight with simple ends. Terminal raphe fissures are absent. The axial area of the rapheless valve is broad, rhomboid, with a horseshoe depression on one side that extends to the valve margin. Striae are biseriate and radiate.
Autecology
Platessa strelnikovae has been so far found in sediments of three lakes in Vermont and Maine. These lakes are soft-water, circumneutral and mesotrophic.
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Size Range, µm3
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Motility
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Attachment
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Habitat
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Colony
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Waterbody
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Distribution
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Original Description
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AuthorEnache, Potapova and E.Morales 2014
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Length Range11-19 µm
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Width6-7 µm
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Striae in 10µm14-17
Original Images
Cite This Page
Potapova, M. (2014). Platessa strelnikovae. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/50190/platessa_strelnikovae
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Platessa strelnikovae 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.
Platessa strelnikovae
- Valves broadly elliptic
- Raphe valve with rhomboid central area
- Rapheless valve with rhomboid axial area
- Rapheless valve with horseshoe depression
Valves are broadly elliptic with rounded, sometimes slightly protracted apices. Raphe valve has narrow, straight axial area, widening towards rhomboid central area. Raphe does not have terminal fissures. Axial area on rapheless valve is broad, rhomboid, with one-sided horseshoe depression extended to the valve margin.