• Category
  • Length Range
    10-14 µm
  • Width Range
    3-4 µm
  • Striae in 10 µm



Valves broadly lanceolate to elliptic, with broadly rounded ends. The axial area is lanceolate and the valve face is flat. The valve face/mantle junction forms a sharp angle. The abvalvar edge of the mantle is parallel to the valve face/mantle junction. In girdle view, frustules are rectangular. Cells form short ribbon-like colonies, joined by linking spines. Striae are distinct, composed of round areolae that decrease in diameter toward the axial area, 12-15 in 10 µm. Striae are parallel in the central area to radiate toward the ends. The striae extend onto the valve mantle, but are interrupted by spines at the valve face/mantle junction. Costae are wider than the striae. Spines are spatulate. Spines are present along the valve face edge, except at the apices and are located on the striae. Small, ocellulimbus type, apical pore fields with round poroids are present on both valve apices. Pore fields are located on junction between valve face/mantle. Rimoportulae are absent. Copulae, or girdle bands, are open and not perforated. Valvocopulum (first girdle band) is wider than the rest of the girdle elements.


Original Description

Frustula cingulari aspectu rectangularia, catenas formantia. Valvae lineari-ellipticae apicibus isopolaribus late rotundatis, 3-12 µm longae, 2-4 µm latae. Area axialis variabilis angusta ad late lanceolato-elliptica, area centralis abest. Striae transapicales punctatae parallelae vel modice radiantes positae, 12-15 in 10 µm.

  • Basionym
    Fragilaria neoelliptica
  • Author
    Witkowski 1984
  • Length Range
    3-12 µm
  • Width
    3-4 µm
  • Striae in 10µm

Original Images

Iconotype 1
Original Description

Citations & Links


  • North American Diatom Ecological Database
    NADED ID: 73007

Cite This Page

Morales, E. (2011). Pseudostaurosira neoelliptica. In Diatoms of North America. Retrieved April 16, 2024, from https://diatoms.org/species/pseudostaurosira_neoelliptica


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