Platessa lutheri
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Category
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Length Range8-17 µm
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Width Range4.5-6.0 µm
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Striae in 10 µm25–29 on raphe valve, 12–15 on rapheless valve
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ContributorMarina Potapova - Jan 2012
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ReviewerLoren Bahls - Jan 2012
Identification
Description
Valves are elliptic. The raphe valve has a narrow linear axial area and a wide, bow-tie-shaped central area. The raphe is straight, filiform, without terminal fissures, and with external distal ends slightly expanded into drop-like pores. The external proximal raphe ends are straight, and positioned within a shallow groove. There are helictoglossae at the internal distal raphe ends. The striae on the raphe valve are uniseriate, and strongly radiate. The rapheless valve has a wide lanceolate axial area bordered by short and broad biseriate striae. The internal openings of areolae on both valves are round.
Autecology
Platessa lutheri has been reported from oligotrophic circumneutral waters and aerial habitats of Europe and North America (Krammer & Lange-Bertalot 2004). This species is rare in the US: it was found by Johasen et al. (2004) in the Great Smoky Mountain National Park and there is one record in the ANSP databases from the Murderkill River, Delaware.
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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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Original Description
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BasionymAchnanthes lutheri
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AuthorHust. 1933
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Length Range9 µm
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Width4.5 µm
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Striae in 10µm30 on raphe valve, 15–16 on rapheless valve
Original Images
Citations & Links
Citations
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Publication Link: doi: 10.1080/0269249X.2011.644636
Cite This Page
Potapova, M. (2012). Platessa lutheri. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/48141/platessa_lutheri
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Platessa lutheri 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 lutheri
- Valves elliptic
- Striae on raphe valve uniseriate, 25-29 in 10 μm
- Striae on rapheless valve biseriate, 12-15 in 10 μm
- Central area on raphe valve bow-tie-shaped
- Axial area on rapheless valve wide, elliptic-lanceolate
Valves are elliptic. The raphe valve has a narrow linear axial area and a wide, bow-tie-shaped central area. The striae on the raphe valve are uniseriate and strongly radiate. The rapheless valve has a wide lanceolate axial area bordered by short and broad biseriate striae.