Diatoms of North AmericaDiatoms of North America

Kurtkrammeria stodderi

(Cleve) Bahls 2015

Encyonopsis Stodderi Guide
  • Category
    Asymmetric Biraphid
  • Length Range
    53-68 µm
  • Width Range
    9.2-11.2 µm
  • Striae in 10 µm
    9-11 at valve center, 11-13 at the ends (dorsal side)
  • Synonyms
    Encyonopsis stodderi (Cleve) Krammer 1997
  • Reported As
    Cymbella stodderi (Cleve sensu Hustedt in Schmidt et al. 1944, fig. 377: 1, 2)

Identification

Encyonopsis Stodderi 1 Encyonopsis Stodderi 2 Encyonopsis Stodderi 3 Encyonopsis Stodderi 4 Encyonopsis Stodderi 5 Encyonopsis Stodderi 6 Encyonopsis Stodderi 7
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Description

Valves are broadly lanceolate with acutely rounded, very weakly protracted apices. The axial area is lanceolate and about one-third the valve width. The central area is absent or weakly expanded on the dorsal side. The raphe is lateral, becoming filiform at the proximal ends. Proximal raphe ends are weakly expanded and tipped towards the dorsal side. Distal raphe ends are reverse-lateral and bent towards the ventral side. Striae are radiate and become parallel then convergent at the apices. Areolae in the striae are very fine and cannot be resolved in LM.

Autecology

Kurtkrammeria stodderi was described (as Cymbella stodderi) from fossil material collected at Bemis Lake in the White Mountains of New Hampshire. In the western United States it has been collected from a fen near Missoula, Montana, from a stream in northern California, and from a pond in Mount Rainier National Park, Washington (photo below). Water quality data are not available for these sites. Cleve (1881) also reports this taxon from Sphagnum in Brazil.

Image 1000001095
Credit: Ryan Davis, Adventurers and Scientists for Conservation.
Berkeley Park Pond, Mount Rainier National Park, Washington: home of Kurtkrammeria stodderi.

Original Description

  • Basionym
    Cymbella stodderi
  • Author
    Cleve 1881
  • Length Range
    75-90 µm
  • Width
    15 µm
  • Striae in 10µm
    10

Original Images

Cymbella stodderi orig illus
Cymbella Stodderi Cleve1881 Origdesc

Cite This Page

Bahls, L. (2014). Kurtkrammeria stodderi. In Diatoms of North America. Retrieved April 20, 2024, from https://diatoms.org/species/encyonopsis_stodderi

Responses

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