Diploneis krammeri

Lange-Bert. and E.Reichardt in Rumrich et al. 2000      Category: Symmetrical biraphid

REPORTED AS: Diploneis ovalis (Krammer and Lange-Bertalot 1986, p. 286, fig. 108: 14-16) 

Diploneis finnica


Diploneis marginestriata

LM scalebar = 10 µm = 40 pixels.


Contributor: Loren Bahls - January 2017
Length Range: 22-62 µm
Width Range: 12.5-23.0 µm
Striae in 10 µm: 11-14


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, 3.8-7.2 µm wide. Striae are uniseriate and radiate throughout. Areolae are large, blocky and number 15-20 in 10 µm.

Lange-Bertalot and Reichardt (2000) refer to D. krammeri as the “false Diploneis ovalis” because it has been misinterpreted by many, including this contributor, as the latter species. The original posting of “D. ovalis” to this website (28.10.2012) was in fact D. krammeri. I thank Elena Jovanovska for bringing this error to my attention.

Original Description

Author: Lange-Bert. and E.Reichardt in Rumrich et al. 2000
Length Range: (10) 20-65 µm
Width Range: (7) 10-25 µm
Striae in 10 µm: 10-14

Original Description

Valvae ellipticae vel lineari-ellipticae (numquam late rhombico-ellipticae) apicibus late rotundatis. Longitudo (10) 20-65 µm, latitudo (7) 10- circiter 25 µm. Raphe leviter arcuata fissuris internis externisque aliquid sed non multum lateralibus sitis inter se, extremis centralibus distincte et fere longe dilatatis fissurisque terminalibus curte deflexis unilateraliter. Area axialis (alias depressiones collaterales raphis) modice angusta. Area centralis (alias nodulus centralis) modice ampla, elliptica “appendices ad instar litterae H” nullae vel inconspicuae apparentes. Diametrus area/noduli centralis 4-6 µm (nec 6-10 µm ut in Diploneis ovalis). Striae transapicales modice radiantes in media valvae ad apices versus magis sed non valde radiantes, 10-14 in 10 µm. Puncta striarum simplicia numquam duplicta nec in quincuncem sita, 10-15 in 10 µm. Quoad aspectum submicroscopicum structurae typicae se praestant significanter imaginibus ultramicrophotogr. (REM), vide tab. 5 et 6 et comarate tab. 1 et 2 speciei Diploneis ovalis.

Original Images

Cite This Page:
Bahls, L. (2017). Diploneis krammeri. In Diatoms of the United States. Retrieved April 23, 2018, from http://westerndiatoms.colorado.edu/taxa/species/diploneis_krammeri

Species: Diploneis krammeri

Contributor: Loren Bahls

Reviewer: Mark Edlund


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

Lange-Bertalot, H. and Reichardt, E. (2000). Diploneis ovalis sensu stricto und Diploneis krammeri nov. spec. Revision des aktuellen Konzepts von Diploneis ovalis (Hilse) Cleve. Appendix, pp. 650-669 in Rumrich, U., Lange-Bertalot, H. and Rumrich, M. (2000). Diatoms of the Andes from Venezuela to Patagonia/Tierra del Fuego and two additional contributions. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 9. Phytogeography-Diversity-Taxonomy. Koeltz Scientific Books, Königstein, Germany, 9:673 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Diploneis krammeri CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Diploneis krammeri has been collected from a few small headwater fens, ponds and streams in the mountains of western Montana (Montana Diatom Database). In this region, it prefers cold, somewhat alkaline, oligotrophic waters with low to moderate conductivity.


Atlantic Pond, Glacier National Park, Montana: home of Diploneis krammeri.

Credit/Source: Loren Bahls