Pinnularia subanglica
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Category
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Length Range27.9-39.9 µm
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Width Range6.3-7.7 µm
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Striae in 10 µm11-14
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Reported AsPinnularia biceps var. pusilla (Camburn and Charles 2000)
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ContributorLaura Aycock - Aug 2022
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ReviewerSarah Spaulding - Aug 2022
Identification
Description
Valves are linear, with straight to weakly convex sides. Apices are capitate, to subcapitate in shorter cells. The axial area is narrow and gradually widens to a rhombic central area with a broad fascia. The raphe is filiform. The proximal raphe ends are slightly expanded and bent toward the primary side of the valve. Externally, the proximal fissures are drop-shaped. Terminal fissures are shaped like a question mark. Striae are radiate in the center, becoming convergent near the apices.
Autecology
P. subanglica is commonly found in lakes and often reported in acidic conditions.
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Size Range, µm3
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Motility
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Habitat
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Colony
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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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AuthorKrammer 2000
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Length Range35-53 µm
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Width7-8 µm
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Striae in 10µm10.5-12
Original Images
Citations & Links
Cite This Page
Aycock, L. (2022). Pinnularia subanglica. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/48286/pinnularia_subanglica
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Pinnularia subanglica 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.
Pinnularia subanglica
- Apices capitate
- Fascia broad
- Axial area narrow
Valves are linear to weakly convex. Apices are capitate. The central area is rhombic, with a broad fascia.