Sellaphora nigri | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

4.2-13 µm
Width Range

2.8-4.2 µm
Striae in 10 µm

26-32

Reported As

Eolimna minima (Moser et al. 1998, Bibliotheca Diatomologica, vol. 38, p. 153)

Contributor

Alison Frohn - May 2016
Reviewer

Eduardo A. Morales - Jun 2016

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Identification

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Description

Cells small, elliptic to oval, with broadly rounded apices. Striae radiate and uniseriate throughout. Striae bordering central area slightly curved. Shorter striae present in middle of valve forming irregular and asymmetric "bow-tie" shaped to irregularly squared central area. Axial area linear, widening slightly toward the central area. Raphe straight with proximal raphe ends tear-drop shaped. Internally, distal raphe fissures end in small helictoglossae. Areolae vary in diameter and shape. Usually, areolae closest to raphe are larger and slightly angular, becoming smaller and more rounded towards margins. Areolae occluded internally.

Autecology

Sellaphora nigri is considered to be widely distributed and pollution-tolerant.

Size Range, µm3

11-100
Motility

Moderately motile
Habitat

Benthic
Waterbody

Inland
Distribution

Great Lakes inventory
Learn more about this

Original Description

Basionym

Navicula nigri
Author

De Not. 1872
Length Range

~10 µm

Original Images

Citations & Links

Citations

Wetzel, C.E., Ector, L., Van de Vijver, B., Compère, P. and Mann, D.G. (2015) Morphology, typification and critical analysis of some ecologically important small naviculoid species (Bacillariophyta) Fottea, Olomouc 15(2): 203–234

Publication Link: 10.5507/fot.2015.020

Cite This Page

Frohn, A. (2016). Sellaphora nigri. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/51264/sellaphora_nigri

Responses

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