Gomphonema turgidum
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Category
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Length Range30-49 µm
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Width Range11.3-15.0 µm
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Striae in 10 µm10-14
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SynonymsGomphonema truncatum var. turgidum (Ehrenb.) R.M.Patrick 1975
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ContributorIan Bishop - Dec 2015
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ReviewerMarina Potapova - Dec 2015
Identification
Description
Valves are strongly asymmetric to the transapical axis, with a broad, truncated headpole, nearly as wide as the central inflation. The footpole is narrow and rounded, with a porefield bisected by the distal raphe. The axial area is wide and linear-lanceolate. The raphe is complex and lateral. The central area is small with central striae of variable length, and containing a single isolated stigma. Striae are parallel to weakly radiate, except at the footpole, where they become strongly radiate. Areolae are coarse and easily visible in LM, measuring 21-26 in 10 µm. Voigt discontinuities are often visible.
Autecology
This taxon was described by Ehrenberg (1854) from fossil deposits in New York and Rhode Island (Smithfield). It has been documented in recent surveys and lake sediment records across the country.
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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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BCG
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Waterbody
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Distribution
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Original Description
- turgidum, Kielselguhr von New-York, Nord-Amerika, T. II. II. F. 40.; Kieselguhr, Smithfield, Rhodes Island, Nord-Amerika, T. IV. II. F. 34.
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AuthorEhrenb. 1854
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 37346
Cite This Page
Bishop, I. (2015). Gomphonema turgidum. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/51166/gomphonema_turgidum
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Gomphonema turgidum 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.
Gomphonema turgidum
- Headpole broad, truncated
- Raphe complex, undulate
- Striae coarse, uniseriate
- Stigma present
Valves are strongly asymmetric to the transapical axis, with broad, truncated headpole. The central area is small ,with central striae of variable length. A single isolated stigma is present. Striae are coarse and uniseriate. Striae are parallel to weakly radiate, except at the footpole, where they become strongly radiate.