• Category
  • Length Range
    39-78 µm
  • Width Range
    19-25 µm
  • Striae in 10 µm
  • Synonyms
    Encyonema turgidum var. ventricosum Temp. and H.Perag.
    Cymbella muelleri f. ventricosum (Temp. and H.Perag.) Reimer
    Encyonema stoermeri S.A.Spauld., Pool and S.Castro



Valves are strongly dorsi-ventral. The dorsal margin is broadly arched, while the ventral margin is distinctly gibbous. Valve length is 39-78 μm; breadth is 19-25 μm. The valve apicies are moderately rounded. The axial area is relatively broad in the central valve, narrowing at the valve ends. The raphe branches have a slight arch towards the ventral margin. Each raphe branch is positioned nearly centrally within the axial area. Proximal raphe ends are slightly expanded and dorsally deflected. Distal raphe ends of the raphe curve slightly to the dorsal margin, but are deflected ventrally near the valve apices. The dorsal striae are divergent. Externally, the rows of dorsal areolae closest to the central area are oval, and become lineolate. Dorsally, central striae number 11-12 in 10 μm, and distal striae number 5 in 5 μm. Ventrally, central striae number 9 in 10 μm, and distal striae number 6 in 5 μm. The density of areolae within a central, dorsal stria is 9 in 5 μm.


Original Description


Nov 01, 2010 - Recognition of later synonym

The name Encyonema stoermeri Spaulding, Pool et Castro was published in 2010, but the authors did not recognize that the type had been previously published as Encyonema temperei Krammer 1997. The website now reflects the correct name, E. temperei, for this taxon.

Cite This Page

Spaulding, S. (2010). Encyonema temperei. In Diatoms of North America. Retrieved June 23, 2024, from https://diatoms.org/species/encyonema_temperei


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