Credit: M. Potapova
A cell of G. lateropuctata
Geissleria lateropunctata
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Category
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Length Range15-25 µm
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Width Range7-9 µm
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Striae in 10 µm18-22
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Reported AsGeissleria neotropica (Metzeltin and Lange-Bertalot 1998)
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ContributorMarina Potapova - Dec 2010
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ReviewerSam Rushforth - Aug 2013
Identification
Description
Valves are elliptical-lanceolate, often slightly dorsiventral, with narrowly rostrate or subrostrate ends, 7.0-9.0 µm wide and 15-25 µm long. The raphe is straight and filiform. The axial area is narrow and linear. The central area is small, with one to five isolated areolae. Striae are uniseriate, radiate, 18-22 in 10 µm. Areolae are apically elongated, 65-70 in 10 µm. Subpolar areolae, or annulae, are larger than areolae on other parts of the valve. The annulae form three-four rows at each pole.
Original Description
Valve late ellipticus, 17-22 µ longis, 8 µ latis, subpole valde constrictus, apicibus subcapitatus, striis subradiantibus, 22-24 in 10 µ, punctum solitarium unilateral prope nodulum cebtrales manifestum.
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BasionymNavicula lateropunctata
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AuthorJ.H.Wallace 1960
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Length Range17-22 µm
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Width8 µm
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Striae in 10µm22-24
Original Images
Original text and images reproduced with permission by Academy of Natural Sciences of Philadelphia.
Citations & Links
Citations
Links
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North American Diatom Ecological DatabaseNADED ID: 210012
Cite This Page
Potapova, M. (2010). Geissleria lateropunctata. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/45188/geissleria_lateropunctata
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Geissleria lateropunctata 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.
Geissleria lateropunctata
- Valves elliptical-lanceolate with narrowly rostrate or subrostrate apices
- Central area formed by one shortened stria at each side
- One to five isolated areolae in central area
- Annulae in three or four rows at poles
Valves are elliptical-lanceolate, often slightly dorsiventral, with narrowly rostrate or subrostrate ends, 7.0-9.0 µm wide and 15-25 µm long. The central area is small, with one to five isolated areolae. Striae are radiate, and number 18-22 in 10 µm. The annulae form three-four rows at each pole.