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
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 20-30 µm
Width Range: 8-9 µm
Striae in 10 µm: 8-10
Description
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 May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/species/placoneis_elginensis
Species: Placoneis elginensis
Contributor: Pat Kociolek
Reviewer: Sarah Spaulding
Image Credit: Pat Kociolek
- Valves elliptical-lanceolate
- Apices protracted, rostrate
- Central area round
Valves are elliptical-lanceolate, with margins convex and apices protracted and rostrate. The central area is round central. Striae are indistinctly punctate, curved and radiate throughout the length of the valve.
Compare
This species is distinguished from other members of the genus by the outline of the valve and distinct, rounded central area.
Citations
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)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 194005