• Category
  • Length Range
    51.7-57.5 µm
  • Width Range
    11.0-12.0 µm
  • Striae in 10 µm
    30-31 at the center, 32-34 at the ends



Valves are linear-lanceolate-rhomboid with rostrate and rounded apices. Areolae are round or oval and form transverse striae that are radiate at the center of the valve and slightly or strongly convergent near the apices. Striae are circumradiate about the apices. In SEM, a single row of isolated areolae next to either side of the raphe forms a continuous line. This line of areolae forms a boundary to the axial area and ovoid central area. The raphe branches are slightly curved. Internal, longitudinal ribs are parallel to the raphe. The longitudinal ribs fuse with the helictoglossae to form a porte-crayon structure, but are incomplete at the central nodule. The central nodule is relatively flat as compared to other Frustulia species. In SEM, the external proximal and distal raphe ends form a small Y-shape.

Original Description

  • Basionym
    Schizonema vulgare
  • Author
    Thwaites 1848

Original Images

Frustulia vulgare orig illus
Frustulia Vulgare Orig Text

Citations & Links

Cite This Page

Kociolek, P., Graeff, C. (2011). Frustulia vulgaris. In Diatoms of North America. Retrieved June 21, 2024, from https://diatoms.org/species/frustulia_vulgaris


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