Diatoms of North AmericaDiatoms of North America

Kurtkrammeria treinishii

(Bahls) Bahls 2015

Encyonopsis Treinischii Guide
  • Category
    Asymmetric Biraphid
  • Length Range
    55-80 µm
  • Width Range
    7.6-10.3 µm
  • Striae in 10 µm
    12-15 at valve center, 14-17 near the apices

Identification

Encyotreinischii 1 Encyotreinischii 2 Encyotreinischii 3 Encyotreinischii 4 Encyotreinischii 5 Encyotreinischii 6
View image metadata

Description

Valves are rhombic-lanceolate and not or weakly dorsiventral. Apices are subrostrate and broadly rounded. Axial and central areas are relatively wide, together forming a narrow longitudinal lanceolate hyaline area. The raphe is lateral, becoming filiform at the proximal and distal ends. Proximal raphe ends are weakly expanded and deflected dorsally. Distal raphe fissures are comma-shaped, concave toward the ventral margin. Striae are radiate, becoming parallel then convergent toward the apices. Striae near the central area are curved and then recurved near the margin, or sinuous. One, or rarely, two stigmata are present on the dorsal side of the central area.

Autecology

This taxon has been collected from a few small lakes and fens in Montana and Washington. Here pH ranges from 6.02 to 7.24 and specific conductance from 30 to 58 µS/cm.

Nada Lake 1
Credit: Ryan Davis, Adventurers and Scientists for Conservation.
Nada Lake, Chelan County, Washington: type locality.

Original Description

Valves rhombic-lanceolate, not or slightly dorsiventral. Apices subrostrate, broadly rounded. Valve length 61.8–79.9 µm; valve width 7.9–10.3 µm. Axial and central areas relatively wide, together forming a narrow longitudinal lanceolate space. Raphe lateral, filiform at the proximal and distal ends. Proximal raphe ends weakly expanded, deflected dorsally. Distal raphe fissures comma-shaped, concave toward the ventral margin. Striae radiate, becoming parallel then convergent toward the apices, 12–15 in 10 µm at valve center, 14–17 in 10 µm near the apices. Striae near the central area are curved and then recurved (sinuous). A single stigma lies at the proximal end of the median stria on the dorsal side.

  • Basionym
    Encyonopsis treinishii
  • Author
    Bahls 2013
  • Length Range
    61.8-79.9 µm
  • Width
    7.9-10.3 µm
  • Striae in 10µm
    12-15 at valve center, 14-17 near the apices

Original Images

Encyonopsis treinishii orig illus
Encyo Treinishii Origdesc005

Updates

Nov 21, 2024 - Transfer from Encyonopsis to Kurtkrammeria

This taxon page appeared under the genus Encyonopsis. The page was updated to follow the transfer to Kurtkrammeria made by Bahls (2015). - S. Spaulding

Cite This Page

Bahls, L. (2013). Kurtkrammeria treinishii. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/kurtkrammeria_treinishii

Responses

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