Cyclostephanos dubius (Fricke) Round; 1982; 326
Key references
Håkansson H. 2002. A compilation and evaluation of species in the genera Stephanodiscus, Cyclostephanos and Cyclotella with a new genus in the family Stephanodiscaceae. Diatom Research. 17(1): 1-139.
Morphology
Size
3-35 µm in diameter (Houk et al. 2014).
Shape
Cells singular or forming chains. Cells cylindrical in girdle view, circular in valve view.
Valve
Valve strongly concentrically undulate with convex or concave central part.
Striae
Radiate fascicles, multiseriate with 2-4 areolae at valve face/mantle junction, becoming uniseriate towards valve centre. Interfascicles 8-12 in 10 µm (Houk et al. 2014). Central area with random arrangement of areolae.
Other features
Conical spines located on interfascicles at valve face/mantle junction.
SEM morphology
A ring of marginal fultoportulae on valve mantle, one to several valve face fultoportulae. One rimoportula situated on valve mantle.
3-35 µm in diameter (Houk et al. 2014).
Shape
Cells singular or forming chains. Cells cylindrical in girdle view, circular in valve view.
Valve
Valve strongly concentrically undulate with convex or concave central part.
Striae
Radiate fascicles, multiseriate with 2-4 areolae at valve face/mantle junction, becoming uniseriate towards valve centre. Interfascicles 8-12 in 10 µm (Houk et al. 2014). Central area with random arrangement of areolae.
Other features
Conical spines located on interfascicles at valve face/mantle junction.
SEM morphology
A ring of marginal fultoportulae on valve mantle, one to several valve face fultoportulae. One rimoportula situated on valve mantle.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Hustedt F. 1930. Die Kieselalgen Deutschlands, Österreichs und der Schweiz mit Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. 1.Teil. Lieferung 2. Akademische Verlagsgesellschaft m.b.H. Leipzig. 273-464 pp | Morphology; Illustrations; Taxonomy |
| Descourtieux-Coqueugniot C. 1981. Stephanodiscus dubius (Fricke) Hustedt: Etude en microscopie optique et en microscopie électronique. Bulletin Mensuel de la Société Linnéenne de Lyon. 8: 244-249. | Morphology; Illustrations |
| Round F.E. 1982. Cyclostephanos - new genus within the Sceletonemaceae. Archiv für Protistenkunde. 125: 323-329. | Morphology; Taxonomy; Illustrations |
| Theriot E., Stoermer E., Håkansson H. 1987. Taxonomic interpretation of the rimoportula of freshwater genera in the centric diatom family Thalassiosiraceae. Diatom Research. 2(2): 251-265. | Illustrations; Morphology |
| Theriot E., Håkansson H., Kociolek J.P., Round F.E., Stoermer E.F. 1987. Validation of the centric diatom genus name Cyclostephanos. British Phycological Journal. 22(4): 345-347. | Taxonomy |
| Hickel B., Håkansson H. 1987. Dimorphism in Cyclostephanos dubius (Bacillariophyta) and the morphology of initial valves. Diatom Research. 2(1): 35-46. | Morphology; Illustrations |
| Pienaar C., Pieterse A.J.H. 1990. Observations on the morphology of Cyclostephanos dubius from the Vaal River, South Africa. Diatom Research. 5(1): 201-205. | Morphology; Illustrations |
| Håkansson H. 2002. A compilation and evaluation of species in the genera Stephanodiscus, Cyclostephanos and Cyclotella with a new genus in the family Stephanodiscaceae. Diatom Research. 17(1): 1-139. | Morphology; Taxonomy; Illustrations |
| Wojtal A.Z., Kwandrans J. 2006. Diatoms of the Wyżyna Krakowsko-Częstochowska upland (S Poland) - Coscinodiscophyceae (Thalassiosirophycidae). Polish Botanical Journal. 51(2): 177-207. | Morphology; Ecology; Illustrations |
| Kobayasi H., Idei M., Mayama S., Nagumo T., Osada K. 2006. H. Kobayasi's Atlas of Japanese Diatoms based on electron microscopy. Volume 1. Uchida Rokakuko Publishing Co., Tokyo. 59 + 533 pp., 180 pls. | Morphology; Illustrations |
| Kiss K.T., Klee R., Ector L., Ács E. 2012. Centric diatoms of large rivers and tributaries in Hungary: morphology and biogeographic distribution. Acta Botanica Croatica. 71(2): 1-53. | Morphology; Illustrations |
| Reavie E.D., Kireta A.R. 2015. Centric, Araphid and Eunotioid Diatoms of the Coastal Laurentian Great Lakes. Bibliotheca Diatomologica. 62: 184. | Morphology; Ecology; Illustrations |
| Genkal S.I., Kulikovskiy M.S., Kuznetsova I.V. 2020. The Recent Freshwater Centric Diatoms of Russia. Filigran, Yaroslavl. 433 pp | Morphology; Illustrations |
| Rott E., Kofler W. 2021. Planktonic centric diatoms from the Eastern Alps: morphology, biogeography and ecology. Plant and Fungal Systematics. 66(1): 1-36. | Morphology; Illustrations; Ecology |
This page should be cited as:
Jüttner I., Schultz K., Wetzel C.E., Ector L., Sayer C., Bennion H., Jones V., Flower R. Cyclostephanos dubius (Fricke) Round; 1982; 326. 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=4495. [Accessed:
].
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Record last modified: 22/04/2021