• Category
  • Length Range
    11.7-15.2 µm
  • Width Range
    3.2-3.5 µm
  • Striae in 10 µm
  • Synonyms
    Navicula suchlandtii Hust. 1943



Valves are linear-lanceolate, with nearly straight margins. Apices are nearly cuneate. The axial area is narrow and linear, widening only slightly at the center valve. The striae are radiate at the center valve, becoming abruptly convergent at the apices. The raphe is slightly arched to one side and asymmetric to the apical axis. The external proximal raphe ends are slightly unilaterally deflected.

Striae extend from the valve face onto the mantle. The mantle is relatively deep. The distal raphe is distinctly recurved. Two to three rows of areolae are present at distal to the terminal raphe ends.

Note that in the original illustration (Hustedt 1943, Taf. 399, Fig. 24-28), two distinct morphologies are shown. The first (Fig. 24) is less than 0.5 the length and width of the second (Figs 25-28). The taxon presented here conforms to the second morphology illustrated by Hustedt. Clearly, the type specimen needs to be examined and, perhaps, these two morphologies clarified as to their species name.


Adlafia suchlandtii is sensitive to organic pollution. The specimens illustrated here were collected from sediments of lakes in northeastern states.

In Europe, others report that it tends to reach its highest abundance in streams (Cantonati et al. 2017).

Original Description

128. Navicula Suchlandti Husted., in A. S. Atl., T. 399, F. 24-28. Schalen linear mit fast parallelen Seiten und stumpf gerundeten, zuweilen leicht keilförmigen Enden, 11-15 μ lang, 2-3 μ breit. Raphe gerade, fadenförmig. Axialarea sher schmal linear, Zentral-area klein, unregelmäßig kreisförmig. Transapikalstreifen im mittelren Teil radial, vor den Polen konvergent, etwa 30 in 10 μ, nur äußerst zart liniert. (Abb. 33, 34).

Vereinzelt im Ausfluß des Schwarzees und im mittleren Grialetschee.

Unterscheidet sich von den andern Arten dieser Gruppe durch die zartere Struktur sowie durch die lineare Schalenform.

  • Basionym
    Navicula suchlandtii
  • Author
    Hust. 1943
  • Length Range
    11-15 µm
  • Width
    2-3 µm
  • Striae in 10µm

Original Images

Navicula Suchlandtii2 Orig Illus
Navicula Suchlandtii Orig Desc

Cite This Page

Tyree, M. (2019). Adlafia suchlandtii. In Diatoms of North America. Retrieved August 09, 2020, from https://diatoms.org/species/adlafia-suchlandtii


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