Eucocconeis americana
-
Category
-
Length Range14.8–39.7 µm
-
Width Range7.8–13.4 µm
-
Striae in 10 µm22–32
-
ContributorMarina Potapova - Aug 2012
-
ReviewerSarah Spaulding - Aug 2012
Identification
View image metadata
Type
Description
Valves are elliptic-lanceolate with flat face and subrostrate apices. Raphe valve has a narrow, straight to slightly sigmoid axial area, which widens towards central area. The central area on the raphe valve is large, symmetric and transversely elliptic to rectangular. The raphe is straight to slightly sigmoid, with terminal fissures bent in opposite directions. The rapheless valve has a narrow, sigmoid axial area and a large hexagonal central area, often extended to the valve margins. Striae are radiate.
Autecology
Eucocconeis americana has been reported from Eastern North America. It was found in streams with low conductivity (12–75μS cm−1) and moderately low pH (5.0–6.3).
-
Waterbody
-
Distribution
- Learn more about this
Original Description
Valves elliptical–lanceolate with flat face and subrostrate apices, 14.8–39.7 μm long, 7.8–13.4 μm wide. Raphe valve with narrow, straight to slightly sigmoid axial area, which widens towards central area. Central area on raphe valve large, symmetrical, transversely elliptical to rectangular. Raphe straight to slightly sigmoid with terminal endings bent in opposite directions. Rapheless valve with narrow, sigmoid axial area and large hexagonal central area often extended to the valve margins. Striae radiate, 22–32 in 10μm.
-
AuthorEnache and Potapova 2012
-
Length Range14.8–39.7 µm
-
Width7.8–13.4 µm
-
Striae in 10µm22–32
Original Images
Citations & Links
Cite This Page
Potapova, M. (2012). Eucocconeis americana. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/48729/eucocconeis_americana
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eucocconeis americana 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.
Eucocconeis americana
- Valves flat, elliptic-lanceolate
- Valves 7.8-13.4 µm wide
- Apices subrostrate
- Central area on raphe valve large, symmetric, transversely elliptic to rectangular
- Central area on rapheless valve large, hexagonal
Valves are elliptic-lanceolate with flat faces and subrostrate apices. Valves are 7.8 to 13.4 µm in width. The central area on the raphe valve is large, symmetric, and transversely elliptic to rectangular. The raphe is straight to slightly sigmoid, with terminal fissures bent in opposite directions. The rapheless valve has a narrow...