Karayevia amoena
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Category
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Length Range5.9-13.0 µm
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Width Range3.2-4.9 µm
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Striae in 10 µm22-26 on raphevalve, 18-20 on rapheless valve
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ContributorMarina Potapova - Nov 2010
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ReviewerRex Lowe - Feb 2011
Identification
Description
Valves are linear-elliptical with capitate to rostrate apices. Both raphe and rapheless valves have a lanceolate axial area and no distinct central area. The raphe is straight. Striae on raphe valve are radiate, becoming parallel to slightly convergent toward the apices, interrupted by a thin longitudinal line in the middle of the valve, 22-26 in 10 µm. Each stria in the middle of the raphe valve consists of two transapically elongated areolae. Striae near apices consist of a single areola. The striae on rapheless valve are slightly radiate, becoming parallel to slightly convergent toward the apices, interrupted by a wide longitudinal hyaline area on each side of the valve, 18-20 in 10 µm. Each stria consists of two transapically elongated areolae that also form longitudinal rows.
Autecology
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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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BCG
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Waterbody
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Distribution
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Original Description
Valvae lineari-ellipticae apicibus late capitatis, circiter 10 µ longae, 4 µ latae. Rhaphovalva rhaphi directa, area axiali angustissima, area centrali nulla, striis ad rhaphin perpendicularibus, circiter 24 in 10 µ. Areovalva area axialis anguste lanceolata, striis transapicalibus validis, circiter 20 in 10 µ, ad rhaphin fere perpendicularibus, utrimque una costa longitudinali decussatis.
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BasionymAchnanthes amoena
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AuthorHust. 1952
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Length Range10 µm
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Width4 µm
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Striae in 10µm24 on raphe valve, 20 on rapheless valve
Original Images
Citations & Links
Citations
Cite This Page
Potapova, M. (2010). Karayevia amoena. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/45040/karayevia_amoena
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Karayevia amoena 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.
Karayevia amoena
- Valves small, 3.2-4.9 µm wide, 5.9-13.0 µm long
- Valve ends capitate to rostrate
- Striae interrupted by a hyaline line at each side of the valve
- Axial area lanceolate
Valves are linear-elliptical with capitate to rostrate apices. Both raphe and rapheless valves have a lanceolate axial area and no distinct central area. Striae are radiate, parallel to slightly convergent at apices. The striae on raphe valve are interrupted by a thin longitudinal line in the middle of the valve, 22-26 in 10 µm. The...