Diatoms of North AmericaDiatoms of North America

Encyonema kamtschaticum

Krammer 1997

Encyonema kamtschaticum guide
  • Category
    Asymmetric Biraphid
  • Length Range
    32.4-64.7 µm
  • Width Range
    12.3-16.5 µm
  • Striae in 10 µm
    10-12 dorsal at valve center; 8-9 ventral at valve center

Identification

Encyonema Kamtschaticum LM1 Encyonema Kamtschaticum LM2 Encyonema Kamtschaticum LM6 Encyonema Kamtschaticum LM3 Encyonema Kamtschaticum LM4 Encyonema Kamtschaticum LM5
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Description

Valves are dorsiventral, with acutely rounded apices. The dorsal margins are strongly arched. The ventral margins are weakly convex. The axial area is wide and merges with the central area. The raphe is lateral, narrowing near the proximal and distal ends. Proximal raphe ends are upturned, with weakly inflated pores. The distal raphe ends are comma-shaped and deflected to the ventral side. 

Dorsal striae are radiate. Ventral striae are radiate at the valve center and about 1/4 the valve width, transitioning to parallel near the apices. Areolae number 16-20 in 10 µm.

Autecology

The specimens shown here are from a Cottonwood Creek, Twin Falls County, in southern Idaho and Mann Lake, Harney County, in eastern Oregon.

The species was originally described from material collected in Kamtschatka, Russia (Krammer 1997) and was also reported by Potapova (2014).

039 11
Credit: Loren Bahls
Mann Lake, Harney County, eastern Oregon.
Encyonema Kamtschaticum Parvum
Credit: Loren Bahls
Two populations of Encyonema kamtschaticum var. parvum from Montana and Oregon (figs 13-25) compared to populations of the nominate variety (figs 1-12).
Encyonema reimeri Sensu Lato Copy
Credit: Loren Bahls
Taxa in the Encyonema reimeri group from the western United States.

Original Description

(66) Encyonema kamtschaticum Krammer nov. spec. (Fig. 63:4-11)

Valvae valde dorsiventrales, margine dorsali valde convexa, margine ventrali leviter convexa, recta vel concavae, ad centrum valvis maioribus leniter tumidis, apicibus acute rotundatis, non protractis, 28-64 µm longae, 13-17 µm latae. Area axialis paulo lata, lanceolata, ad nodulum centralem versus dilatata, area centralis vix formata. Raphe excentrica, ad aream centralem atque ad apices sensim filiformis, alibus locis lata, terminis proximalibus at latus dorsalis inclinatis, fissuris distalibus in latus ventralis deflexis. Stigmoidea nulla. Striae transapicales distincte punctatae-lineolatae, punctae 16-18 in 10 µm. Striae in latere dorsali modice radiantes, 10-11 in 10 µm.

Locus typicus: Kamtschatka, leg. Möller, Wedel.

ITypus: Praep. 1172 IOK (Isotypi: Cleve & Möller No. 30).

  • Author
    Krammer 1997
  • Length Range
    26-64 µm
  • Width
    10-17 µm
  • Striae in 10µm
    9-11

Original Images

Encyonema Kamtschaticum Origimag001
Encyonema Kamtschaticum Origimag002
Encyonema Kamtschaticum Origdesc001

Cite This Page

Bahls, L. (2018). Encyonema kamtschaticum. In Diatoms of North America. Retrieved March 23, 2026, from https://diatoms.org/species/94611/encyonema-kamtschaticum

Responses

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