Placoneis elginensis

(Gregory) Cox 1987      Category: Symmetrical biraphid
BASIONYM: Pinnularia elginensis Gregory 1856
SYNONYM(S): Navicula elginensis (Gregory) Ralfs in Pritchard 1861 | Placoneis dicephala var. elginensis (Gregory) Mereschkowsky 1903 

Placoneis anglophila


Placoneis gastrum

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek - March 2011
Length Range: 20-30 µm
Width Range: 8-9 µm
Striae in 10 µm: 8-10


Valves are elliptical-lanceolate, margins convex, with apices protracted and rostrate. The axial area is narrow at the apices, widening slightly towards the center, where a round central area is present. The raphe is straight and filiform with external proximal ends rounded. Striae are indistinctly punctate, curved and radiate throughout the length of the valve.

Original Description

Basionym: Pinnularia elginensis
Author: Gregory 1856
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Placoneis elginensis. In Diatoms of the United States. Retrieved September 29, 2016, from

Species: Placoneis elginensis

Contributor: Pat Kociolek

Reviewer: Sarah Spaulding


Cox, E.J. (1987). Placoneis Mereschkowsky: the re-evaluation of a diatom genus originally characterized by its chloroplast type. Diatom Research 2: 145-157.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Placoneis elginensis CAS

NCBI Genbank Taxonomy

Placoneis elginensis NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 194005

Autecology Discussion