Diatoms of North AmericaDiatoms of North America

Geissleria lateropunctata

(J.H.Wallace) Potapova and D.M.Winter 2006

Geissleria Lateropunctata Guide Copy
  • Category
    Symmetric Biraphid
  • Length Range
    15-25 µm
  • Width Range
    7-9 µm
  • Striae in 10 µm
    18-22
  • Reported As
    Geissleria neotropica (Metzeltin and Lange-Bertalot 1998)

Identification

Geissleria lateropunctata LM5 Geissleria lateropunctata LM2 Geissleria lateropunctata LM4 Geissleria lateropunctata LM3 Geissleria lateropunctata LM1
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Geissleria lateropunctata SEM2 Geissleria lateropunctata SEM1

Description

Valves are elliptical-lanceolate, often slightly dorsiventral, with narrowly rostrate or subrostrate ends, 7.0-9.0 µm wide and 15-25 µm long. The raphe is straight and filiform. The axial area is narrow and linear. The central area is small, with one to five isolated areolae. Striae are uniseriate, radiate, 18-22 in 10 µm. Areolae are apically elongated, 65-70 in 10 µm. Subpolar areolae, or annulae, are larger than areolae on other parts of the valve. The annulae form three-four rows at each pole.

Autecology

Gs132049 Later Unboiled1 Ed
Credit: M. Potapova
A cell of G. lateropuctata

Original Description

Valve late ellipticus, 17-22 µ longis, 8 µ latis, subpole valde constrictus, apicibus subcapitatus, striis subradiantibus, 22-24 in 10 µ, punctum solitarium unilateral prope nodulum cebtrales manifestum.

  • Basionym
    Navicula lateropunctata
  • Author
    J.H.Wallace 1960
  • Length Range
    17-22 µm
  • Width
    8 µm
  • Striae in 10µm
    22-24

Original Images

Orig Ill Gelater
Orig Descr Gelater
Original text and images reproduced with permission by Academy of Natural Sciences of Philadelphia.

Cite This Page

Potapova, M. (2010). Geissleria lateropunctata. In Diatoms of North America. Retrieved November 23, 2024, from https://diatoms.org/species/geissleria_lateropunctata

Responses

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