Geissleria punctifera
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Category
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Length Range16-27 µm
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Width Range6.0-8.5 µm
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Striae in 10 µm16-18
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Reported AsNavicula aikenensis (Patrick 1959)
Geissleria aikenesis ((Patrick) Torgan and Oliveira 2001)
Geissleria schmidiae (Lange-Bert. and Rumrich in Rumrich et al. 2000)
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ContributorMarina Potapova - Dec 2010
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ReviewerSam Rushforth - Aug 2013
Identification
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Type
Description
Valves are lanceolate with subrostrate broadly rounded ends, 6.0-8.5 µm wide and 16-27 µm long. The raphe is straight and filiform. The axial area is narrow and linear. The central area is small, formed by one shortened stria on each side of the valve, with an isolated stigma. Striae are uniseriate, radiate, 16-18 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 rows at each pole.
Geissleria aikenensis (Patrick) Torgan and Oliveira 2001 is a later homonym of G. punctifera, and G. punctifera has priority over G. aikenensis (Potapova 2010, 2013). The holotype slide housed at the Academy of Natural Sciences of Philaldelphia for Navicula aikenensis (originally spelled “aikenenses”) was examined by Torgan and Oliveira (2001).
Autecology
Apparently, G. punctifera has a Western Hemisphere distribution. Hustedt described Navicula punctifera from a river in Brazil. More recent records reported it from additional locations in South America (Rumrich et al. 2000). In North America, it has been reported from rivers in the southeast U.S. (Potapova 2010, 2013) and California.
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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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BCG
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Waterbody
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Distribution
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Original Description
Valvae elliptico-lanceolatae apicibus obtuse rostratis, 15— 23 μ longae, 6—9 μ latae. Rhaphe directa, area axialis anguste linearis, area centralis parva, rotundata vel irregulariter dilatata. Striae transapicales radiantes, 16—18 in 10 μ, in media parte interdum striis brevioribus intercalatis, delicatissime lineolatae vel punctatae. Area centralis uno latere cum poro singulo.
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BasionymNavicula punctifera
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AuthorHust. 1952
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Length Range15-23 µm
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Width6-9 µm
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Striae in 10µm16-18
Original Images
Citations & Links
Citations
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Publication Link: http://www.jstor.org/stable/4064508
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Publication Link: 10.1635/053.160.0102
Cite This Page
Potapova, M. (2010). Geissleria punctifera. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/45178/geissleria_punctifera
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Geissleria punctifera 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 punctifera
- Valves lanceolate with broadly subrostrate apices
- Central area formed by one shortened stria at each side
- One isolated areola in central area
- Annulae in three rows at poles
Valves are lanceolate with subrostrate broadly rounded ends, 6.0-8.5 µm wide and 16-27 µm long. The central area is small, formed by one shortened stria on each side of the valve, with an isolated stigma. Striae are radiate, 16-18 in 10 µm. The annulae form three rows at each pole.