Credit: panoramio.com
Upper Seymour Lake, Anaconda-Pintler Wilderness, Deer Lodge County, Montana: type locality of Encyonopsis anacondae.
Encyonopsis anacondae
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Category
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Length Range16.6-24.4 µm
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Width Range3.2-4.0 µm
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Striae in 10 µm25-28
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ContributorLoren Bahls - May 2013
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ReviewerMark Edlund - Aug 2013
Identification
Description
Valves are narrowly linear to linear-lanceolate and slightly dorsiventral. Dorsal and ventral margins are weakly convex. The apices are rostrate and deflected slightly to the ventral side. The axial area is narrow and located near the apical axis. The central area is very small, barely wider than the axial area. The raphe is filiform. Proximal raphe ends are unexpanded and deflected toward the dorsal margin. Distal raphe fissures are hooked toward the ventral margin. Striae are weakly radiate to parallel.
Autecology
Encyonopsis anacondae is known only from Upper Seymour Lake in the Anaconda Range of southwest Montana (photo below). Upper Seymour Lake lies at an elevation of 2512 m and has circumneutral water with low dissolved solids.
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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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Waterbody
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Original Description
Valves narrowly linear to linear-lanceolate, slightly dorsiventral. Dorsal and ventral margins weakly convex. Valve length 16.6–24.4 µm; valve width 3.2–4.0 µm. Apices rostrate, deflected slightly to the ventral side. Axial area narrow, near valve median line. Central area very small, barely wider than the axial area. Raphe filiform. Proximal raphe ends unexpanded, deflected toward the dorsal margin. Distal raphe fissures hooked toward the ventral margin. Striae weakly radiate, 25–28 in 10 µm.
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AuthorBahls 2013
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Length Range16.6-24.4 µm
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Width3.2-4.0 µm
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Striae in 10µm25-28
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
Cite This Page
Bahls, L. (2013). Encyonopsis anacondae. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/49294/encyonopsis_anacondae
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Encyonopsis anacondae 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.
Encyonopsis anacondae
- Valves linear to linear-lanceolate
- Valve margins weakly arched
- Striae 25-28 in 10 µm
- Central area very small
- Apices rostrate
Valves are linear to linear-lanceolate, with weakly convex margins and rostrate apices. The central area is very small. Striae number 25-28 in 10 µm.