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Home / Diatoms / Pennate / Unicells / Biraphes / Asymmetric / Cymbella |
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Name derivation: |
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Greek cymb meaning a cup or a boat, ella meaning small. |
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Classification: |
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Cymbella C.Agardh, 1830; 230 of 1359 species descriptions are currently accepted taxonomically (Guiry 2013).Order Cymbellales; Family CymbellaceaeSynonym: Cocconema (at least in part) Ehrenberg 1832.
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Morphology: |
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Cells slightly to strongly curved dorsiventrally, appearing like an orange slice. Can be colonial, forming branched mucilage stalks or as single cells. One plastid has two H-shaped plates that connect toward the dorsal side of the girdle forming an enlarged bridge.
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Similar genera: |
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Closely related to Encyonema and is distinguished by the orientation and structure of the raphe. Cymbella has a wide bridge-like raphe.
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Habitat: |
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Found in freshwater and can be epiphytic on mud, sand and stones.
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References: |
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Agardh, C.A. 1830. Conspectus Criticus Diatomacearum. Part 1. pp. 1-16. Lundae [Lund]: Literis Berlingianus. Ehrenberg, C.G. 1832. Über die Entwickelung und Lebensdauer der Infusionsthiere; nebst ferneren Beiträgen zu einer Vergleichung ihrer organischen Systeme. Abhandlungen der Königlichen Akademie Wissenschaften zu Berlin, Physikalische Klasse 1831: 1-154, pls I-IV. Guiry, M.D. and Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 11 January 2013. Round, F. E., Crawford, R. M., Mann, D. G. 1990. The Diatoms. Cambridge University Press. New York, NY.
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