• Category
  • Length Range
    55-73 µm
  • Width Range
    14-14.5 µm
  • Striae in 10 µm



Valves are lanceolate, with obtusely rounded ends. The axial area is narrow and widens gradually into a more or less circular central area. The central area is about one-half to one-third as wide as the valve. The raphe is lateral, with expanded proximal ends that are slightly deflected to the primary side. Striae are radiate, becoming convergent near the ends and more widely spaced at the center. Areolae number 16-18 in 10 µm.


This taxon reaches its greatest abundance rivers and streams that are high in dissolved solutes. It has been documented in such streams in New Jersey and Pennsylvania; images shown here are from Wissahickon Creek, Pennsylvania.

Original Description

  • Author
    Lange-Bert. and Witkowski 0

Original Images

Navicula Peregrinopsis Orig002
Navicula Peregrinopsis Orig001

Cite This Page

Aycock, L. (2019). Navicula peregrinopsis. In Diatoms of North America. Retrieved June 19, 2024, from https://diatoms.org/species/navicula-peregrinopsis


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