Pinnularia transversa
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Category
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Length Range168.6-224.5 µm
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Width Range16-19 µm
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Striae in 10 µm8-10
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SynonymsNavicula transversa A. Schmidt
Pinnularia major var. transversa A. Schmidt
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ContributorMicaela Kersey, Marina Potapova - Jun 2022
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ReviewerLoren Bahls, Sarah Spaulding - Jul 2022
Identification
Description
Valves are linear, with a slightly gibbous center. The length to width ratio is relatively high (10-12 length to 1 width). The axial area is linear. Central area is asymmetric, wider on primary side of the valve and only slightly wider than the axial area. The striae are radiate at the center and convergent at the apices, where they are slightly longer on the primary valve side. The raphe is lateral ,with proximal ends slightly expanded and deflected. Terminal raphe fissures are hook-shaped.
Autecology
Pinnularia transversa is found in lakes of northeastern US and in cold, low-nutrient waters in the Cascades and Rocky Mountains.
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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
5. 6. Monticello, N. transversa A. S. (It is so named because of the strikingly sloping and therefore wide-appearing fissure channels).
7. Cherryfield, 8. 9. Duck Pond, Waterford, Maine, after Grunow N. macilenta (Pinn.) E? it seems to me that the illustrations of N. macilenta fit the forms corresponding to T. 42, F. 9. 10.
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BasionymNavicula transversa
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AuthorA. Schmidt 1876
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Length Range160-246 µm
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Width17-23 µm
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Striae in 10µm8-10
Original Images
Citations & Links
Citations
Cite This Page
Kersey, M., Potapova, M. (2022). Pinnularia transversa. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/219153/pinnularia-transversa
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Pinnularia transversa 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 transversa
- Valves long and narrow
- Axial area linear
- Central area narrow, asymmetric
- Raphe lateral
- Terminal raphe fissures hooked
Valves are linear, long, and narrow. The axial area is linear and slightly widened into slightly elliptic, asymmetric central area. The striae are radiate in the center and convergent at the apices. The raphe is lateral and terminal raphe fissures are hook-shaped.