• Category
  • Length Range
    12–38 µm
  • Width Range
    3–5 µm
  • Striae in 10 µm
  • Synonyms
    Fragilaria mazamaensis (Sovereign) Lange-Bert.



Valves are lanceolate with attenuate and capitate ends, slightly swollen in the middle portion, width 3-5 µm, length 12-38 µm. Striae number 19-23 in 10 µm. The external openings of the areolae are apically elongated. Axial area is linear and very narrow. The central area is asymmetrical about the apical median plane, and ghost striae may be present in some specimens. One rimportula is present at a valve apex. Apical pore fields are present at both apices. The pores within the apical porefields are arranged in parallel rows.



Original Description

Valvae lanceolatae apicibus attenuatis, capitatis, 13-40 µ longae, 3-5 µ latae. Costa media longitudinalis (pseudoraphe) angustissima, area axialis nulla, area centralis unilateralis. Striae transapicales 19-23 in 10 µ, lenissime radiantes.

  • Author
    Sovereign 1958
  • Length Range
    13-40 µm
  • Width
    3-5 µm
  • Striae in 10µm

Original Images

Symazam  Orig Illustr
Symazam  Orig Descr
Original text and images reproduced with permission by Blackwell Publishing.

Citations & Links


  • Index Nominum Algarum
  • North American Diatom Ecological Database
    NADED ID: 66062

Cite This Page

Potapova, M. (2009). Synedra mazamaensis. In Diatoms of North America. Retrieved June 23, 2024, from https://diatoms.org/species/synedra_mazamaensis


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