Navicula rhynchocephala Kützing; 1844; 152
Key references
Lange-Bertalot H. 1993. 85 neue Taxa und über 100 weitere neu definierte Taxa ergänzend zur Süßwasserflora von Mitteleuropa Vol.2/1-4. Bibliotheca Diatomologica 27, J. Cramer, Berlin, Stuttgart. 454 pp
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
Size
50-56 µm long, 9-10 µm wide (UK population), 40-60 µm long, 8.5-10 µm wide (Lange-Bertalot 2001).
Shape
Valves elliptic-lanceolate with long protracted rostrate to subcapitate ends.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Striae radiate in central part of valve, becoming parallel away from centre, convergent near valve ends. Striae coarsely lineate, areolae visible in LM.
Axial area
Narrow linear axial area, slightly widening towards valve centre.
Central area
Moderately large rounded central area, approximately half the size of valve width, bordered by 3-4 shortened, often more distantly placed striae.
Raphe
Straight with expanded, drop-like proximal ends, ending within the central area; terminal fissures hooked at apices.
50-56 µm long, 9-10 µm wide (UK population), 40-60 µm long, 8.5-10 µm wide (Lange-Bertalot 2001).
Shape
Valves elliptic-lanceolate with long protracted rostrate to subcapitate ends.
Symmetry
Isopolar, bilaterally symmetrical.
Striae
Striae radiate in central part of valve, becoming parallel away from centre, convergent near valve ends. Striae coarsely lineate, areolae visible in LM.
Axial area
Narrow linear axial area, slightly widening towards valve centre.
Central area
Moderately large rounded central area, approximately half the size of valve width, bordered by 3-4 shortened, often more distantly placed striae.
Raphe
Straight with expanded, drop-like proximal ends, ending within the central area; terminal fissures hooked at apices.
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 | Morphology; Description; Illustrations |
| Cox E.J. 1987. Studies on the diatom genus Navicula Bory. VI. The identity, structure and ecology of some freshwater species. Diatom Research. 2(2): 159-174. | Morphology; Illustrations |
| Lange-Bertalot H. 1993. 85 neue Taxa und über 100 weitere neu definierte Taxa ergänzend zur Süßwasserflora von Mitteleuropa Vol.2/1-4. Bibliotheca Diatomologica 27, J. Cramer, Berlin, Stuttgart. 454 pp | Morphology; Illustrations; Ecology; |
| Lange-Bertalot H. 2001. Navicula sensu stricto. 10 Genera Separated from Navicula sensu lato. Frustulia. Ruggell, A.R.G. Gantner. 526 pp | Morphology; Illustrations |
| Cetin A.K., Yildirim V. 2007. Distribution and occurrence of the diatom community in Göksu stream, Adiyaman, Turkey. Fresenius Environmental Bulletin. 16(5): 555-560. | Ecology |
| Morales-Duarte S.J., Donato-Rondón J.C., Castro-Rebolledo M.I. 2010. Response of Navicula rhynchocephala (Bacillariophyceae) to nutrient enrichment in an Andean stream. Acta Biológica Colombiana. 15(2): 73-78. | Ecology |
| 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; Ecology; Illustrations; |
This page should be cited as:
Jüttner I., Ector L. Navicula rhynchocephala Kützing; 1844; 152. 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=3527. [Accessed:
].
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Record last modified: 27/12/2020