• Category
  • Length Range
    27-31 µm
  • Width Range
    6.0-6.8 µm
  • Striae in 10 µm
  • Reported As
    Navicula secreta var. apiculata (Patrick 1959)
    Navicula ammophila (Witkowski et al. 2000)



Valves are lanceolate to linear-lanceolate with protracted apices. The axial area is narrow and straight. The central area is round. External proximal raphe ends are straight and close to each other. Striae are straight and slightly radiate around the center, becoming parallel, then convergent at the apices. The areolae are clearly visible under LM, 23-26 in 10 μm.


Brackish water; in inland waters of high ionic content, estuaries, and in coastal habitats

Original Description

Valves linear with parallel margins and strongly rostate acute ends, about 30 μ long, 6 μ broad. Raphe straight, threadlike, with approximate central pores; axial area very narrow; central area small, elongate-elliptical. Transapical striae slightly radiate, slightly convergent at the ends, about 15 in 10 μ, rather coarsely lineate, lineolae about 24 in 10 μ.

  • Author
    Hust. 1955
  • Length Range
    30 µm
  • Width
    6 µm
  • Striae in 10µm

Original Images

Nasubrostell  Or Ill001
Nasubrostell  Or Descr001

Cite This Page

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


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