• Category
  • Length Range
    12-15.5 µm
  • Width Range
    2.5-3.3 µm
  • Striae in 10 µm



Valves are linear-lanceolate with very slightly protracted apices. The axial area is narrow and straight. The central area is small. The raphe is straight, with close proximal ends. Striae are strongly radiate around the center, becoming convergent at the apices. The areolae are indistinguishable under LM, approximately 50 in 10 μm.


Although this taxon was not recorded in high abundance in the EPA Western EMAP survey, it was found in waters with high nutrient concentrations, sediments, and watershed disturbance.

Original Description

Valves narrow, linear lanceolate, apices rounded to subcapitate, length of 14-17 µm, 2.5-3.3 µm width. Raphe straight and filiform, bent at the end, axial area narrow and linear, central area rounded, transapical striae radial in the center, highly convergent in the poles, 19-22 in 10 µm. Striae made up by 6-8 areolae/µm (in S.E.M.).

  • Basionym
    Navicula longicephala var. vilaplanii
  • Author
    Lange-Bert. and Sabater in Sabater et al. 1990

Original Images

N Vilaplanii  Orig Ill1
N Vilaplanii  Orig Ill2
N Vilaplanii  Orig Descr

Cite This Page

Potapova, M. (2011). Navicula vilaplanii. In Diatoms of North America. Retrieved June 23, 2024, from https://diatoms.org/species/navicula_vilaplanii


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