Diploneis ovalis
(Hilse) Cleve 1891 Category: Symmetrical biraphid
BASIONYM: Pinnularia ovalis Hilse in Rabenhorst 1861
REPORTED AS: Diploneis ovalis (Krammer and Lange-Bertalot 1986, p. 286, fig. 108: 14-16)
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Loren Bahls - October 2012
Length Range: 22-62 µm
Width Range: 12.5-23.0 µm
Striae in 10 µm: 11-14
Description
Valves are elliptic to linear-elliptic with broadly rounded apices. The longitudinal canals are narrow, the width of one to three areolae, and follow along the margins of the axial and central areas. The axial area is occupied almost completely by a broad raphe sternum that encloses the raphe. The central area is large and orbicular, especially in larger specimens. Striae are uniseriate and radiate throughout. Areolae are large, blocky and number 15-20 in 10 µm.
Original Description
Basionym: Pinnularia ovalis
Author: Hilse in Rabenhorst 1861
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Bahls, L. (2012). Diploneis ovalis. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/diploneis_ovalis
Species: Diploneis ovalis
Contributor: Loren Bahls
Reviewer: Sam Rushforth
Image Credit: Loren Bahls
- Valves elliptic to linear-elliptic
- Longitudinal canals narrow
- Striae uniseriate
- Central area large, orbicular
Diploneis ovalis has elliptic to linear-elliptic valves with a large orbicular central area. Striae are uniseriate and longitudinal canals are narrow.
Compare
Diploneis finnica has biseriate striae, wide longitudinal canals, and a small central area.
Diploneis finnica
Citations
Cleve, P.T. (1891). The Diatoms of Finland. Actas Societas Pro Fauna et Flora Fennica 8 (2): 1-68.
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.
Rabenhorst, L.G. (1861). Die Algen Europa’s Forsetzung der algen Sachsens, resp. Mittel-Europa’s. Decades 3-4, numbers 1021-1040. Dresden.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 30009
Autecology Discussion
Diploneis ovalis is widely distributed in small headwater fens, ponds and streams in the mountains of the northwestern United States (Montana Diatom Database). Here it prefers cold, somewhat alkaline, oligotrophic waters with low to moderate conductivity (see table below). Common diatom associates of D. ovalis include Navicula aurora, Caloneis tenuis, Pinnularia borealis, Stauroneis kriegeri, Aulacoseira alpigena, and Fragilaria virescens.
Images
Atlantic Pond, Glacier National Park, Montana: home of Diploneis ovalis.
Credit/Source: Loren Bahls
Abundance-weighted means of selected water quality variables measured concurrently with collection of samples containing Diploneis ovalis.
Credit/Source: Montana Diatom Database