• Category
  • Length Range
    16.3-20.6 µm
  • Width Range
    4.2-5.2 µm
  • Striae in 10 µm



Valves are lanceolate with subrostrate apices. The axial area is narrow and linear. The central area is small and rectangular to elliptical. The raphe is straight, filiform, with slightly expanded external proximal ends. The distal raphe ends are deflected to the secondary valve side. The striae are uniseriate, slightly radiate to parallel in the valve center and slightly convergent at the apices. The areolae are elongated, mostly oriented to the apical axis and approximately 30 in 10 μm. A hylaine area and one or two apical rows of areolae are present at each end of the valve.


Original Description

  • Author
    Lange-Bert. 2001
  • Length Range
    15-21 µm
  • Width
    4.8-5.4 µm
  • Striae in 10µm

Original Images

Hicox  Or Ill
Hicox  Or Descr001

Citations & Links

Cite This Page

Potapova, M. (2011). Hippodonta coxiae. In Diatoms of North America. Retrieved July 13, 2024, from https://diatoms.org/species/hippodonta_coxiae


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Hippodonta coxiae 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.