Tetracyclus rupestris
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Category
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Length Range8.0-22.4 µm
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Width Range4.7-8.4 µm
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Striae in 10 µm24-28
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SynonymsGomphogramma rupestre (Kütz.) Braun in Rabenh. 1853
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ContributorIan Bishop - Jan 2016
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ReviewerSarah Spaulding - Jan 2016
Identification
Description
Valves are elliptic-lanceolate, with broad, unconstricted apices. The axial area is wide and indistinct. Striae are parallel, with individual erratic striae that intrude into the axial area. Costae are primary and robust, and become inflated and relatively indistinct in axial area; 3-4 in 10 µm. A single rimoportula is present at one valve end. Girdle bands are incomplete. Septae extend approximately 1/4 of the way into the valve, and alternate orientation from one band to the next.
Recent work suggests that the name of this taxon needs to be reconsidered (Williams et al. 2021) and this page needs to be revised. Tetracyclus rupestre may a European species.
Autecology
The specimens imaged for this page were collected from Nantahala River near Rainbow Springs, North Carolina. Similar to T. hinziae and T. glans (2/4 of the other extant Tetracyclus species known) populations in the Pacific Northwest, T. rupestris is found to co-occur with specific araphid taxa in the Tabellaria, Meridion, and Odontidium genera.
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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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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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BasionymDenticula thermalis var. rupestris
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AuthorKütz. 1849
Original Images
Citations & Links
Citations
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Publication Link: 10.1080/00071618700650451
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Publication Link: 10.11646/phytotaxa.498.1.5
Cite This Page
Bishop, I. (2016). Tetracyclus rupestris. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/51206/tetracyclus_rupestris
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Tetracyclus rupestris 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.
Tetracyclus rupestris
- Valves elliptic-lanceolate
- Septae distinct
- Costae robust, parallel
- Rimoportula present
Valves are elliptic-lanceolate, with broadly rounded apices. Septae are distinct and extend approximately 1/4 of the way into the valve. Septae alternate orientation from one band to the next. Costae are robust and parallel. A single rimoportula is present at one valve end.