Cymbella affinis Kützing; 1844; 80
Key references
Tuji A. 2007. Type examination and typification of Cymbella affinis Kütz., C. turgidula Grunow and C. uenoi Skvortsov. Diatom. 23: 49-54.
da Silva W.J., Jahn R., Ludwig T.A.V., Hinz F., Menezes M. 2015. Typification and taxonomic status re-evaluation of 15 taxon names within the species complex Cymbella affinis/tumidula/turgidula (Cymbellaceae, Bacillariophyta). PhytoKeys. 53: 1-25.
Morphology
Size
21.5-34.5 µm long, 6.5-7.5 µm wide.
Shape
Valves with convex dorsal margin, slightly convex ventral margin and rounded, rostrate ends.
Symmetry
Dorsiventral, isopolar.
Striae
Striae parallel to slightly radiate, becoming radiate towards valve ends, 10-12 in 10 µm in valve centre (Ireland population).
Axial area
Narrow, linear, slightly curved.
Central area
Not differentiated from axial area.
Raphe
Raphe slightly displaced towards ventral margin, raphe curved towards ventral margin near proximal raphe ends, which are slightly enlarged, straight or slightly bent ventrally; dorsally deflected terminal raphe fissures.
21.5-34.5 µm long, 6.5-7.5 µm wide.
Shape
Valves with convex dorsal margin, slightly convex ventral margin and rounded, rostrate ends.
Symmetry
Dorsiventral, isopolar.
Striae
Striae parallel to slightly radiate, becoming radiate towards valve ends, 10-12 in 10 µm in valve centre (Ireland population).
Axial area
Narrow, linear, slightly curved.
Central area
Not differentiated from axial area.
Raphe
Raphe slightly displaced towards ventral margin, raphe curved towards ventral margin near proximal raphe ends, which are slightly enlarged, straight or slightly bent ventrally; dorsally deflected terminal raphe fissures.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Kützing F.T. 1844. Die Kieselschaligen Bacillarien oder Diatomeen. Fr. Fritsch, Nordhausen. 152 pp; 30 pls | Taxonomy; Description; Morphology; Type Illustration |
| Tuji A. 2007. Type examination and typification of Cymbella affinis Kütz., C. turgidula Grunow and C. uenoi Skvortsov. Diatom. 23: 49-54. | Morphology; Taxonomy; Type Illustration; |
| da Silva W.J., Jahn R., Ludwig T.A.V., Hinz F., Menezes M. 2015. Typification and taxonomic status re-evaluation of 15 taxon names within the species complex Cymbella affinis/tumidula/turgidula (Cymbellaceae, Bacillariophyta). PhytoKeys. 53: 1-25. | Morphology; Type Illustration; Taxonomy; |
| Lange-Bertalot H., Hofmann G., Werum M., Cantonati M. 2017. Freshwater Benthic Diatoms of Central Europe: Over 800 Common Species Used in Ecological Assessment. Cantonati M., Kelly M.G., Lange-Bertalot H. (eds.), Koeltz Botanical Books, Schmitten-Oberreifenberg, Germany. 942 pp | Morphology; Illustrations; Taxonomy |
This page should be cited as:
Jüttner I., Ector L. Cymbella affinis Kützing; 1844; 80. 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=4112. [Accessed:
].
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Record last modified: 06/12/2022