Psammothidium sacculus
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Category
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Length Range8-13 µm
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Width Range3.9-4.4 µm
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Striae in 10 µm26-30
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SynonymsAchnanthes saccula J.R. Carter 1981
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ContributorMarina Potapova - Aug 2024
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ReviewerSarah Spaulding - Aug 2024
Identification
Description
Valves are elliptic to linear-elliptic. The raphe valve has a narrow linear axial area and a transversely rectangular or bow-tie shaped central area bordered by a few striae of various lengths. The raphe is straight, without terminal fissures with simple and very slightly expanded distal and proximal ends. The central raphe ends curve toward opposite sides internally. The rapheless valve has a narrow rhomboid axial area, which widens in the valve center into small and often asymmetric central area. Striae are radiate on both valves. Areolae are visible in LM.
Autecology
This taxon has been mostly reported from colder regions of Northern Hemisphere. Specimens illustrated on this page are from collections in sites in Alaska.
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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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Occurrence
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Waterbody
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Distribution
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Original Description
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BasionymAchnanthes saccula
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AuthorJ.R.Carter 1981
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Length Range10 µm
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Width4 µm
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Striae in 10µm30-32
Original Images
Citations & Links
Citations
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Publication Link: 10.1080/0269249X.1996.9705361
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Publication Link: https://doi.org/10.7872/crya/v39.iss4.2018.465
Updates
Oct 31, 2024 - Correction of specific epithet
From 8/26/2024 until 10/31/2024, this taxon appeared as Psammothidium sacculum. As of 10/31/2024, the ending is corrected to "sacculus" to match the Latin ending for a noun, rather than an adjective. - S. Spaulding
Cite This Page
Potapova, M. (2024). Psammothidium sacculus. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/62684/psammothidium-sacculus
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Psammothidium sacculus 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.
Psammothidium sacculus
- Valves elliptic to linear-elliptic
- Raphe valve with transversely rectangular or bow-tie shaped central area
- Rapheless valve with narrow rhombic axial area
- Striae radiate
- Areolae often distinct in LM
Valves are elliptic to linear-elliptic. The raphe valve has a transversely rectangular (or bow-tie) shaped central area bordered by a few striae of various lengths. The rapheless valve has a narrow rhomboid axial area, which widens in the valve center into small and often asymmetric central area. Striae are radiate on both valves....