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Green Algae

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Green Algae

Yellow-green algae
Botydium granulatum
Scientific classification
Domain: Eukaryota
Kingdom: Chromalveolata
Phylum: Heterokontophyta
Class: Xanthophyceae
Allorge, 1930,[1] emend. Fritsch, 1935[2]
Synonyms
  • Heteromonadida Leedale, 1983[3]
  • Heterokontae Luther, 1899[4]
  • Tribophyceae Hibberd, 1981[5]
  • Xanthophyta Hibberd, 1990[6]

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. Xanthophyte chloroplasts contain the photosynthetic pigments Chlorophyll a, Chlorophyll c, β-Carotene, and the carotenoid diadinoxanthin.[7] Unlike other heterokonts, their chloroplasts do not contain fucoxanthin, which accounts for their lighter colour. Its storage polysaccharide is chrysolaminarin.[7] Xanthophyte cell walls are produced of cellulose and hemicellulose.[7] They appear to be the closest relatives of the brown algae.

Classifications

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

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.[9]

The Xanthophyceae were placed before in the division Chrysophyta, e.g., in the classification of Smith (1938). In this classification, there are six orders:

In a classification presented by thallus, there are seven orders:

Informal groups, according to Maistro et al. (2009):[10]

  • Botrydiopsalean clade
  • Chlorellidialean clade
  • Tribonematalean clade
  • Vaucherialean clade

Unicellular flagellates, amoeboid and palmelloid taxa were not included in this study.

According to Adl et al. (2012):[11]

  • Tribonematales (genera Botrydium, Bumilleriopsis, Characiopsis, Chloromeson, Heterococcus, Ophiocytium, Sphaerosorus, Tribonema, Xanthonema)
  • Vaucheriales (genus Vaucheria)

See also

References

  1. ^ Allorge, P. (1930). Heterocontées ou Xanthophycées? Rev. Alg. 5: 230.
  2. ^ Fritsch, F.E. (1935) The Structure and Reproduction of the Algae. Volume I. Introduction, Chlorophyceae, Xanthophyceae, Chrysophyceae, Bacillariophyceae, Cryptophyceae, Dinophyceae, Chloromonadineae, Euglenineae, Colourless Flagellata. Cambridge University Press, Cambridge.
  3. ^ Leedale, G.F. (1985). "Order 5, Heteromonadida Leedale, 1983". In Lee, John J.; Hutner, Seymour Herbert; Bovee, Eugene C. An illustrated Guide to Protozoa. Lawrence, Kansas: Society of Protozoologists. pp. 70–. 
  4. ^ Lüther, A. (1899). "Über Chlorosaccus eine neue Gattung der Süsswasseralgen". Bihang til Kongliga Svenska Vetenskaps-Akademiens Handlingar 24: 1–22.  
  5. ^ Hibberd, D. J. (February 1981). "Notes on the taxonomy and nomenclature of the algal classes Eustigmatophyceae and Tribophyceae (synonym Xanthophyceae)". Botanical Journal of the Linnean Society 82 (2): 93–119.  
  6. ^ Hiberd, D. J. (1990). "Phylum Xanthophyta". In Margulis, L.; Corliss, J. O.; Melkonian, M. et al. Handbook of Protoctista. Boston, Massachusetts, USA: Jones and Bartlett Publishers. pp. 686–97. 
  7. ^ a b c Stace, Clive A. (1991). Plant Taxonomy and Biosystematics. Cambridge University Press.  
  8. ^ Christensen, T. 1987. Seaweeds of the British Isles. Volume 4 Tribophyceae (Xanthophyceae). British Museum (Natural History), London ISBN 0-565-00980-X
  9. ^ Adl SM, Simpson AG, Farmer MA, et al. (2005). "The new higher level classification of eukaryotes with emphasis on the taxonomy of protists". The Journal of Eukaryotic Microbiology 52 (5): 399–451.  
  10. ^ Maistro S, Broady PA, Andreoli C, Negrisolo E (August 2009). "Phylogeny and taxonomy of Xanthophyceae (Stramenopiles, Chromalveolata)". Protist 160 (3): 412–26.  
  11. ^ Adl SM, Simpson AG, Lane CE, et al. (September 2012). "The revised classification of eukaryotes". The Journal of Eukaryotic Microbiology 59 (5): 429–93.  
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