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Sellaphora nigri

(De Not.) Wetzel and Ector 2015      Category: Symmetrical biraphid
BASIONYM: Navicula nigri De Not. 1872

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

Sellaphora moesta


Sellaphora pulchra

LM scalebar = 10 µm = 80 pixels.


Contributor: Alison Minerovic - May 2016
Length Range: 4-13 µm
Width Range: 2.8-4.2 µm
Striae in 10 µm: 26-32


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.

Original Description

Basionym: Navicula nigri
Author: De Not. 1872
Length Range: ~10 µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Minerovic, A. (2016). Sellaphora nigri. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Sellaphora nigri

Contributor: Alison Minerovic

Reviewer: Eduardo A. Morales


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. 10.5507/fot.2015.020

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Sellaphora nigri CAS

North American Diatom Ecological Database (NADED)

NADED ID: 170135

Autecology Discussion

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