• Category
  • Length Range
    19-25 µm
  • Width Range
    6.5-7.0 µm
  • Striae in 10 µm
    18-22
  • Synonyms
    Navicula mutica var. ventricosa (Kütz.) Cleve and Grunow
    Stauroneis ventricosa Kütz.

Identification

Description

Valves are linear, with capitate apices. The axial area is narrow and linear. The central area is bow-tie-shaped to transapically rectangular ,or elliptic. A single stigma is located slightly closer to valve center than to the margin. The raphe is straight and filiform. The proximal raphe fissures are curved to the primary valve side. Similarly, the distal raphe fissures are curved to the primary valve side. Striae are coarsely punctate and radiate. The striae are composed of 4-5 areolae. The areolae are variable in size; the areolae are largest near the valve margin and they decrease in size closer to the sternum.

Note that these specimens are more elongate than the original illustrations of Kützing (1844). Further work is needed to determine the features of the type material and if this North American form is a distinct taxon. This species should not be confused with Antarctic species that are capitate, but have a number of other distinguishing features (Kohler et al. 2015).

Autecology

This species is known from Arctic regions.

Original Description

19. STAURONEIS VENTRICOSA. Tf. 30. Fig. 72. (420/1). St. minutissima media valde, apicibus minus inflata, capitata, bis constricta, apertura media oblonga transversali non percurrente. Long. 1/110"'.

Nordhausen!

  • Basionym
    Stauroneis ventricosa
  • Author
    Kütz. 1844

Original Images

Lut Ventricosa Orig Ill
Lut Ventricosa Orig Descr

Cite This Page

Potapova, M. (2019). Luticola ventricosa. In Diatoms of North America. Retrieved September 25, 2021, from https://diatoms.org/species/luticola-ventricosa-1

Responses

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