• Category
  • Length Range
    9-21 µm
  • Width Range
    4.5-8.0 µm
  • Striae in 10 µm
  • Synonyms
    Nitzschia sinuata var. tabellaria (Grunow) Grunow
    Denticula tabellaria Grunow



Valves are rhombic to lanceolate and expanded at mid-valve. The apices are variable, from nearly capitate to rounded. The fibulae are distinct and elongate (crossing about ½ of the valve face). Fibulae number 6-8 in 10 µm. Striae are distinctly punctate and radiate. A central nodule is absent.


Original Description

  • Basionym
    Denticula tabellaria
  • Author
    Grunow 1862


Feb 15, 2020 - Recognition of Grunowia

This taxon was originally described as Denticula tabelleria Grunow. It was later transferred to Grunowia tabellaria (Grunow) Rabenhorst 1864. It appeared as Nitzschia sinuata var. tabelleria (Grunow) Grunow 1881 on this website from January 2014 until February 2020. - S. Spaulding

Cite This Page

Kociolek, P. (2011). Grunowia tabellaria. In Diatoms of North America. Retrieved June 13, 2024, from https://diatoms.org/species/grunowia_tabellaria


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