• Category
  • Length Range
    12.2-23.3 µm
  • Width Range
    6.4-7.4 µm
  • Striae in 10 µm



Valves of are elliptic-linear, with broadly rounded apices. The central area is small, and not inflated at the central area. The raphe is narrow. The longitudinal canals are straight and nearly parallel throughout the length of the valve. Striae are slightly radiate. In larger specimens, the striae are nearly parallel in the center, and become radiate near the apices. Areolae are not discernable in LM.


This species is not common in North America, but it has been found across the the U.S. It has been reported from rivers of the southeast and California in USGS surveys, and in lakes sediments of the northeast in an EPA survey.

Original Description

Diploneis marginestriata nov. spec. Tab. nostr. Fig. 5.

Schalen länglish-elliptisch mit fast parallelen Seitenrändern und breit abgerundeten Polen. Raphe gerade, mit voneinander entfert stehenden Zentral poren. Hörner des Zestralknotens schmal, paralled laufend. Furchen breit, einen elliptischen Raum von 1/2 -2/3 Schalenbreit einschliessend. Sterifen randständig, leicht radial, etwa 20 in 10 µ, zart punktiert, am Innenrand der Furchen als zarte Strichreihe angedeutet.
Länge: 20-35 µ. Breite: 9-13 µ.
U.S. Im Vegetationsgürtel sehr selten, häufig dagegen in fast allen Schlammproben von 7-31 m Tiefe. Vereinzelt auch Algen im Kanal.

  • Author
    Hustedt 1922
  • Length Range
    20-35 µm
  • Width
    9-13 µm
  • Striae in 10µm

Original Images

Diploneis Marginestriata  Hustedt 1922

Citations & Links

Cite This Page

Vaccarino, M. (2016). Diploneis marginestriata. In Diatoms of North America. Retrieved November 16, 2019, from https://diatoms.org/species/diploneis_marginestriata


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