Eunotia triodon Ehrenberg; 1837; 45
Key references
Lange-Bertalot H., Bąk M., Witkowski A. 2011. Eunotia and some related genera. Diatoms of European Inland Waters and Comparable Habitats. A.R.G. Gantner Verlag K.G., Ruggell. 747 pp
Morphology
Size
Length 25-110 µm, maximum width 13-22 µm (Lange-Bertalot et al. 2011).
Shape
Dorsal margin with three broadly rounded undulations, ventral margin concave. Dorsal margin tapering abruptly to narrower, shortly protracted, broadly rounded poles.
Symmetry
Dorsiventral, isopolar.
Striae
Radiate throughout, curved towards valve ends. Most striae extending the width of the valve, shorter striae can be intercalated at dorsal margin, 15-18 in 10 µm in centre, 18-24 towards valve ends (Lange-Bertalot et al. 2011).
Raphe
Terminal fissures clearly visible on valve face at valve ends, terminating in centre of poles. Raphe slightly curved on mantle with expanded proximal ends.
SEM morphology
A narrow sternum extending from distal raphe ends parallel to ventral margin. Raphe short, ending < 1/3 along valve mantle, internally terminating in helictoglossa.
External areola openings occluded.
Narrow ridge present on dorsal mantle.
Valvocopula and adjacent copula similar in structure, open bands with 5-6(7) rows of pores on pars exterior. Bands becoming progressively narrower.
Length 25-110 µm, maximum width 13-22 µm (Lange-Bertalot et al. 2011).
Shape
Dorsal margin with three broadly rounded undulations, ventral margin concave. Dorsal margin tapering abruptly to narrower, shortly protracted, broadly rounded poles.
Symmetry
Dorsiventral, isopolar.
Striae
Radiate throughout, curved towards valve ends. Most striae extending the width of the valve, shorter striae can be intercalated at dorsal margin, 15-18 in 10 µm in centre, 18-24 towards valve ends (Lange-Bertalot et al. 2011).
Raphe
Terminal fissures clearly visible on valve face at valve ends, terminating in centre of poles. Raphe slightly curved on mantle with expanded proximal ends.
SEM morphology
A narrow sternum extending from distal raphe ends parallel to ventral margin. Raphe short, ending < 1/3 along valve mantle, internally terminating in helictoglossa.
External areola openings occluded.
Narrow ridge present on dorsal mantle.
Valvocopula and adjacent copula similar in structure, open bands with 5-6(7) rows of pores on pars exterior. Bands becoming progressively narrower.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Ehrenberg C.G. 1837. Über ein aus fossilen Infusorien bestehendes, 1832 zu Brod verbackenes Bergmehl von den Grenzen Lapplands in Schweden. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1837. 43-45 pp | Taxonomy |
| Ehrenberg C.G. 1838. Die Infusionsthierchen als vollkommene Organismen. Ein Blick in das tiefere organische Leben de Natur. Verlag von Leopold Voss, Leipzig. 1-xvii, 1-548 pp; 1-64 pls | Illustrations |
| Lange-Bertalot H., Bąk M., Witkowski A. 2011. Eunotia and some related genera. Diatoms of European Inland Waters and Comparable Habitats. A.R.G. Gantner Verlag K.G., Ruggell. 747 pp | Morphology; Illustrations; |
This page should be cited as:
Jüttner I., Williams D. M. Eunotia triodon Ehrenberg; 1837; 45. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M..
Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=4556. [Accessed:
].
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Record last modified: 05/12/2022