Diatoms of North AmericaDiatoms of North America

Chamaepinnularia krookii

(Grunow) Lange-Bert. and Krammer 1999

Chamaepinnularia krooki guide
  • Category
    Symmetric Biraphid
  • Length Range
    18.8-22 µm
  • Width Range
    4-5.1 µm
  • Striae in 10 µm
    15-19
  • Synonyms
    Pinnularia krookii (Grunow) Cleve 1891
    Navicula krookii Grunow 1882
  • Reported As
    Navicula ignobilis (Krasske 1938 (nom. illeg.))

Identification

Chamaepinularia krookii LM5 Chamaepinnularia krookii LM2 Chamaepinnularia krookii LM1 Chamaepinnularia krookii LM3 Chamaepinnularia krookii LM4 Chamaepinularia krookii LM6 Chamaepinularia krookii LM5
View image metadata
Chamaepinnularia krookii SEM1

Description

Valves are linear, with a distinct central expansion. Apices are capitate. The axial area is narrow and linear, expanding into a rhombic-lanceolate central area. The striae are formed by a single areola and are radiate at the center of the valve, transitioning to slightly convergent at the apices. The raphe is filiform.

Note that Grunow (1882) named this taxon for the Swedish botanist Krook, but in the original description wrote the specific epithet "krockii".  In 1891, Cleve, corrected the orthographic error to Pinnularia krookii, a change also noted in Krammer (1992).

Autecology

This taxon is considered to be cosmopolitan, with reports of its distribution from the Arctic to the Antarctic (Schimani et al. 2024), including growing on snowfields.

It was originally described from a subfossil of a brackish-water habitat (Grunow 1843).

Original Description

Navicula Krockii Grun. in litteris. Am nächsten verwandt mit Pinnularia globiceps Greg. unterscheidet sie sich davon durch viel kleinere Gestalt und engere, in der Mitte nicht unterbrochene Querstreifen. Die Schalen sind 0.019-0.028 mm lang, in der Mitte 0.0055-0.007 mm breit, Querstreifen in der Mitte stark radial, 15-17 in 0.01 mm, an den Enden entgegengesetzt gerichtet 19—21 in 0.01 mm. Nicht selten in verschiedenen Lagern bei Soos. Sonst liegt mir diese Art nur noch von Wester-botten vor, wo sie Krock in schwach salzigem Wasser lebend sammelte. Tab. XXX (II), Fig. 40.

  • Basionym
    Navicula krockii
  • Author
    Grunow 1882
  • Length Range
    19-28 µm
  • Width
    5.5-7 µm
  • Striae in 10µm
    15-17 in center, 19-21 at the ends.

Original Images

Chamaepinnularia krookii orig illus
Chammaepinnularia krookii orig desc

Citations & Links

Citations

Links

Cite This Page

Leppik, S., Potapova, M. (2024). Chamaepinnularia krookii. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/chamaepinnularia-krookii

Responses

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