Credit: USGS BioData
Distribution of Diploneis elliptica in rivers of the continental U.S. based on the National Water Quality Assessment program. Retrieved 16 June 2015.
Diploneis elliptica
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Category
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Length Range30-65 µm
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Width Range17-36 µm
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Striae in 10 µm9-10
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ContributorBrina Kamae - Jun 2015
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ReviewerLoren Bahls - Oct 2015
Identification
Description
Valves are elliptic, with convex margins and rounded apices. The axial area is narrow-lanceolate, expanding slightly from the apices to the central area. The central area is large and round. Longitudinal canals are present on both sides of the axial and central areas. Longitudinal canals are widest near the central area and narrow towards the valve apices. The raphe is straight with expanded proximal raphe ends. Terminal raphe fissures deflect unilaterally, terminating short of the valve margin. Striae are radiate mid-valve, becoming strongly radiate towards the apices. Striae composed of complex, round to rectangular areolae. Striae are uniseriate. Areolae number 11-14 in 10 µm. Usually one row of areolae is positioned along the longitudinal canal, but in some specimens, two rows may occur.
Autecology
Diploneis elliptica was found in a benthic sample in Cold Creek, San Bernardino County, California. Diploneis elliptica was also found in mud surface and moss squeeze in Excelsior Fen, Dickinson County, Iowa. The genus Diploneis is typically associated with epipelon and can be found in freshwater, brackish, and marine environments (Cleve 1894).
Other distributional and ecological records include Iceland, Sweden, Finland, Germany, England, New Zealand, North America, and Ecuador (Cleve 1894). In a collection from Lake Hövsgöl, an ancient and large freshwater lake in north-central Mongolia, 25 Diploneis taxa were identified (Jovanovska et al. 2015). Diploneis elliptica was found on sand, epipelon, sediments, marl habitats, and epiphytic on Chara, a green algae (Jovanovska et al. 2015).
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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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BCG
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Waterbody
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Distribution
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Credit: USGS BioData
Distribution of Diploneis elliptica in rivers of Alaska based on the National Water Quality Assessment program. Retrieved 16 June 2015.
Original Description
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BasionymNavicula elliptica
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AuthorKütz. 1844
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Striae in 10µm12-13
Original Images
Citations & Links
Citations
Cite This Page
Kamae, B. (2015). Diploneis elliptica. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/50682/diploneis_elliptica
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Diploneis elliptica 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.
Diploneis elliptica
- Valves elliptic
- Central area large, round
- Striae radiate
- Striae uniseriate
Valves are elliptic. The central area is large and round. Striae are radiate throughout, becoming more strongly radiate near the apices. Striae are uniseriate. Most specimens have a single row of areolae along the longitudinal canal, but in some specimens there may be two rows of areolae.