Diatoms of North AmericaDiatoms of North America

Eolimna sp.1 SESQA

Eolimna sp.1 SESQA Guide2
  • Category
    Symmetric Biraphid
  • Length Range
    7.9-10.9 µm
  • Width Range
    3.7-4.3 µm
  • Striae in 10 µm
    19-20

Identification

Eolimna sp.1 SESQA LM2 Eolimna sp.1 SESQA LM1 Eolimna sp.1 SESQA LM6 Eolimna sp.1 SESQA LM3 Eolimna sp.1 SESQA LM5 Eolimna sp.1 SESQA LM7 Eolimna sp.1 SESQA LM4
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Description

Valves are elliptic to linear-elliptic. The raphe is straight and filiform. The proximal raphe ends are slightly expanded and straight, or nearly so. The distal raphe ends are deflected to the same side. The axial area is very narrow and lanceolate. The central area is variable in size and shape. The areolae are coarse and distinct, forming radiate striae. A row of areolae is positioned next to the axial area. The remaining areolae are separated by a longitudinal hyaline line. The striae are composed of interrupted areolae. 

This taxon was previously associated with Eolimna metafarta, however this taxon has a much finer striae density and is currently being evaluated as a potentially undescribed species. Because of this, the taxon is currently being identified using the operational taxon unit applied to this taxon in Bishop et al. (2017).

Autecology

This taxon was found in the Southeast Regional Survey (Bishop et al. 2017) in samples from Virginia.

Original Description

Updates

May 06, 2025 - CORRECTION:

From 8/11/2019 until 6/6/2025, the images on this page were include in the taxon Eolimna metafarta Kulikovskiy and Lange-Bert. 2015. Additional material from North America and further consideration of the original description and illustrations of the type lead us to conclude that the taxon shown on this page is not aligned with E. metafarta. We understand the taxon illustrated on this page to be an undescribed species. For now, we refer to it as its designation during analysis as Eolimna sp.1 SESQA (Bishop et al. 2017). - S. Spaulding

Cite This Page

Bishop, I. (2019). Eolimna sp.1 SESQA. In Diatoms of North America. Retrieved June 20, 2025, from https://diatoms.org/species/51237/eolimna_sp.1_sesqa

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Eolimna sp.1 SESQA 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.