• Category
  • Length Range
    363-678 µm
  • Width Range
    23-31 µm
  • Striae in 10 µm
  • Synonyms
    Synedra scalaris Ehrenb.
    Nitzschia scalaris (Ehrenb.) W.Smith



The valves are linear and very long, with maximum length of nearly 800 µm. The apices are cuneate and slightly swollen. A longitudinal undulation is present on the valve face. The striae are parallel and uniseriate. Groups of 3-7 striae are separated by fibulae. Length of fibulae is variable, but most of them extend to the midpoint of the valve.


This diatom lives on the lake surface sediments. According to Siver and Hamilton (2011), T. scalaris is found in slightly acidic waterbodies with moderate specific conductivity.

Original Description

  • Basionym
    Synedra scalaris
  • Author
    Ehrenb. 1843

Original Images


Cite This Page

Markarian, D., Potapova, M. (2023). Tryblionella scalaris. In Diatoms of North America. Retrieved June 23, 2024, from https://diatoms.org/species/tryblionella-scalaris


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