• Category
  • Length Range
    11-15 µm
  • Width Range
    5.0-6.4 µm
  • Striae in 10 µm
  • Synonyms
    Achnanthes hustedtii (Krasske) Reimer in R.M.Patrick and Reimer
  • Reported As
    Achnanthes rupestoides (Hohn)



Valves are elliptical. The raphe valve has a narrow axial area and a transversely elliptical or rectangular central area. The rapheless valve has a wide lanceolate axial area and no distinct central area. The raphe is straight, with slightly expanded terminal and central ends, and lacks terminal fissures. Striae are radiate and biseriate. The external and internal openings of the areolae are circular or somewhat angular and isodiametric.


Original Description

Cocconeis Hustedtii nov. spec. -(Fig. 10a, b). - Elliptisch, Oberschale mit kurzen, leicht strahlenden Streifen, 18 - 20 in 10µ, die eine breit lanzettliche Pseudoraphe von etwa einem Drittel der Schalenbreite freilassen. Unterschale: enge Axial-Area und breite quadratische Zentralarea, Streifen etwas enger, 19 - 22 in 10µ. Länge 12 - 17 µ, Breite 5 - 7 µ.- Fundort : Wand eines Schulaquariums,hier trotz öfterer Reinigung stets in Massen. Doch auch in Aquarien des Herrn LOUIS SCHLUZE Cassel beobachtet.

  • Basionym
    Cocconeis hustedtii
  • Author
    Krasske 1923
  • Length Range
    12-17 µm
  • Width
    5-7 µm
  • Striae in 10µm
    19-22 on raphe valve, 18-20 on rapheless valve

Original Images

Platessa Hustedtii  Orig Ill
Platessa Hustedtii  Orig Descr

Cite This Page

Potapova, M. (2011). Platessa hustedtii. In Diatoms of North America. Retrieved May 18, 2024, from https://diatoms.org/species/platessa_hustedtii


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