Yellow-green algae

Yellow-green algae

Taxobox
name = Yellow-green algae
domain = Eukaryota
regnum = Chromalveolata
phylum = Heterokontophyta
classis = Xanthophyceae
classis_authority = Allorge ex Fritsch

Yellow-green algae or xanthophytes are an important group of heterokont algae. Most live in freshwater, but some are found in marine and soil habitats. They vary from single-celled flagellates to simple colonial and filamentous forms. Unlike other heterokonts, their chloroplasts do not contain fucoxanthin, which accounts for their lighter colour. They appear to be the closest relatives of the brown algae.

Orders

The Xanthophyceae have been divided into the following four orders in some classification systems:

*Order Botrydiales
*Order Mischococcales
*Order Tribonematales Pascher
*Order Vaucheriales Nägeli ex Bohlin Christensen, T. 1987. "Seaweeds of the British Isles." Voilume 4 Tribophyceae (Xanthophyceae). British Museum (Natural History), London ISBN 0 565 00980 X]

Recent ultrastructural and molecular phylogenetic DNA (nuclear and plastid) research shows that the Mischococcales might be paraphyletic, and the Tribonematales and Botrydiales polyphyletic, and suggests two orders at most be used until the relationships within the division are sorted [Sina M. Adl, Alastair G. B. Simpson, Mark A. Farmer, Robert A. Andersen,O. Roger Anderson, John R. Barta, Samuel S. Bowser, Guy Brugerolle,Robert A. Fensome, Suzanne Fredericq, Timothy Y. James, Sergei Karpov,Paul Kugrens, John Krug, Christopher E. Lane, Louise A. Lewis, Jean Lodge, Denis H. Lynn,David G. Mann, Richard M. Mccourt, Leonel Mendoza, Øjvind Moestrup,Sharon E. Mozley-Standridge, Thomas A. Nerad, Carol A. Shearer, Alexey V. Smirnov,Frederick W. Spiegel And Max F. J. R. Taylor, 2005. The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists, "J". "Eukaryot". "Microbiol"., 52(5), pp. 399–451.] :

*Order Tribonematales
*Order Vaucheriales

References

ee also

* Coccolithophore
* Cyanobacteria
* Brown Algae
* Diatom
* Golden Algae
* Green Algae
* Red Algae


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  • yellow-green algae — yel′low green al′gae n. pl. mcr bio algae of the phylum Chrysophyta, having mostly yellow and green pigments, occurring in soil, on moist rocks and vegetation, and on ponds and stagnant waters • Etymology: 1925–30 …   From formal English to slang

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  • yellow-green alga — noun Date: 1930 any of a class (Xanthophyceae of the division Chrysophyta) of algae with the chlorophyll masked by brown or yellow pigment …   New Collegiate Dictionary

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