• Category
  • Length Range
    18-71 µm
  • Width Range
    8.5-14 µm
  • Striae in 10 µm
  • Synonyms
    Surirella ovalis var. minuta (Bréb.) Van Heurck
    Surirella ovata var. minuta (Bréb.) A.Cleve.
    Surirella pinnata var. minuta (Bréb.) Schum.
  • Reported As
    Surirella pinnata (W. Smith 1853)
    Surirella ovata (Kützing 1844 pro parte)



Valves 18-71 µm long by 8.5-14 µm wide, with a length to width ratio between 2 and 5. The keel is low and alar canals are not visible. Valves are heteropolar, with the headpole slightly broader and rounder than the footpole. Apices are broadly rounded and the valve sides are straight,tapering slightly toward the footpole. Fibulae 9-12 in 10 μm, extending from the mantle to the apical axial line. Costae are fine, 25-32 in 10 µm, extending from the valve margin to the apical axis. Every third or fourth costae is raised, 6-9 in 10 µm. 3-5 rows of areolae exist between the costa, which are only visible in the SEM. A single row of what appear to be large areolae in the LM occurs around the circumference of the valve, between the keel and the valve face. These structures are actually indentations in the valve face.


Original Description

S. minuta. Breb. in litt. - S. a latere primario late cuneata, truncata, secundario ovata, striis marginalibus delicatulis in 1/100''' parte 7-9. - Long. 1/100-1/47'''. - Frustulia subquadrata Breb. Alg. Falaise p. 45. Pl. VI. - Surirella ovata Kg. bacill. {. 62. Tab. 7. Fig. I. II. III. IV. - In Germania, Gallia

  • Author
    Bréb. ex Kütz. 1849
  • Length Range
    21.2-45 µm
  • Striae in 10µm

Original Images

Surirella minuta orig illus

EMAP Assessment

EMAP Distribution

Surirella Minuta 40 Copy
Map 40

Response Plots

Surirella Minuta Copy

Cite This Page

English, J. (2011). Surirella minuta. In Diatoms of North America. Retrieved January 25, 2020, from https://diatoms.org/species/surirella_minuta


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