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Fragilaria

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Genus of single-celled organisms

Fragilaria
Fragilaria crotonensis
Scientific classification Edit this classification
Domain: Eukaryota
Clade: Diaphoretickes
Clade: SAR
Clade: Stramenopiles
Phylum: Gyrista
Subphylum: Ochrophytina
Class: Bacillariophyceae
Order: Fragilariales
Family: Fragilariaceae
Genus: Fragilaria
Lyngbye (1819)
Species

see text

Fragilaria is a genus of freshwater and saltwater diatoms. It is usually a colonial diatom, forming filaments of cells mechanically joined by protrusions on the face and in the center of their valves. The individual diatoms appear swollen in their centers where they are joined to the colonial ribbon. The genus grows as both plankton and benthic species, free living in colonies or as epiphytes. Some species are bloom forming diatoms in eutrophic lakes. The type species is Fragilaria pectinalis Lyngbye from designating a lectotype from Conferva pectinalis O.F.Müller. The taxonomy of the genus is still uncertain.

Fragilaria has been the dominant genus of diatoms in Lake Mývatn in Iceland for at least 1200 years. The genus currently accounts for around 93% of all diatoms in the lake.

Description

The Fragilaria have a pseudoraphe, rather than a true longitudinal groove in their valves. The valves are symmetrical with transverse striae.

Selected species

References

  1. Williams, David M.; Kociolek, J. Patrick (2011-07-23). "An Overview of Diatom Classification with Some Prospects for the Future". In Seckbach, Joseph; Kociolek, Patrick (eds.). The Diatom World. Dordrecht: Springer. p. 61. ISBN 978-94-007-1327-7.{{cite book}}: CS1 maint: date and year (link)
  2. Wehr, John D.; Sheath, Robert G. (Jun 5, 2015). Freshwater Algae of North America: Ecology and Classification (Aquatic Ecology). Elsevier. ISBN 9780123858771.
  3. ^ John, David M.; Whitton, Brian A.; Brook, Alan J., eds. (2011). The Freshwater Algal Flora of the British Isles : An Identification Guide to Freshwater and Terrestrial Algae (2nd ed.). Cambridge: Cambridge University Press. ISBN 9780521193757.
  4. ^ Matthíasardóttir, Theódóra (2009). Sveiflur kísilþörunga í Mývatni [Fluctuations of diatoms in Lake Mývatn] (BSc) (in Icelandic). Háskóli Íslands, Jarðvísindadeild. hdl:1946/3308.

External links

Taxon identifiers
Fragilaria
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