Credit: USGS BioData
Distribution of D anceps in the continental U.S. rivers sampled for the National Water Quality Assessment program. (Retrieved 08 May 2015)
Meridion anceps
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Category
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Length Range10.4-65 µm
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Width Range5.2-7.0 µm
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Striae in 10 µm18-23
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SynonymsDiatoma anceps (Ehrenb.) Kirchn. 1878
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ContributorIan Bishop - May 2015
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ReviewerRex Lowe - May 2015
Identification
Description
Valves are apically and transapically symmetric; linear with capitate ends. Small valves, however, may be more elliptical with less capitate ends than larger valves. Valves possess both primary and secondary costae, which measure 3.3-4.9 in 10 µm. Striae are visible in LM but individual areolae cannot be observed. The sternum is central and well-defined. Each valve has a single, sub-apical rimoportula.
Autecology
Meridion anceps is widely distributed across North America, notably in the western United States. It can be found in aerophilic zones, wet walls, small creeks, larger rivers. It is common in submerged mosses and liverworts and co-occurs with several species in the Meridion, Diatoma, Tabellaria, and Tetracylus genera.
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Size Range, µm3
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Motility
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Habitat
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Waterbody
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Distribution
- Learn more about this
Credit: USGS BioData
Distribution of D anceps in the Alaskan rivers sampled for the National Water Quality Assessment program. (Retrieved 08 May 2015)
Original Description
F? anceps, parva linearis testulis a latere laxe striatis, apicibus, constrictis obtusis subcapitatis. Gomphonema Pupulae affinis.
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BasionymFragilaria anceps
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AuthorEhrenb. 1843
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
Updates
Jun 27, 2023 - Expansion of size range
From May 2015 until June 2023, the length range of this taxon was posted as 10.4-45.8 µm. Images of larger specimens were added to the page, and the posted length was updated to 10.4-65 µm. - S. Spaulding
Cite This Page
Bishop, I. (2015). Meridion anceps. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/50511/meridion_ancep
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Meridion anceps 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.
Meridion anceps
- Valve symmetric to the transapical axis
- Ends subcapitate to capitate
- Costae 3.3-4.9 in 10 µm
- Central sternum present
- Distinct subapical rimoportula present
Valves are symmetric and linear, with subcapitate to capitate ends. Costae measure 3.3-4.9 in 10 µm. Striae are visible in LM, but individual areolae are not resolved. The sternum is central and well-defined. Each valve has a single, sub-apical rimoportula.