Chrysophyceae

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Definition

noun

(phycology) A taxonomic class comprised of chrysophytes (golden algae)


Supplement

Chrysophyceae is a taxonomic class that includes the chrysophytes or the golden algae. It belongs to Phylum Chrysophyta, which includes not just the chrysophytes but also the xanthophytes (Class Xanthophyceae), and bacillariophytes (Class Bacillariophyceae). 1 Many of the chrysophytes live in freshwater. They are characterized mainly by the presence of the pigment fucoxanthin in high amounts. Many of the members of Chrysophyceae are flagellated. Some of them have one flagellum such as that of Chromulina sp. Others have two flagella such as those of Ochromonas sp. Although most of them are flagellated some chrysophytes are non-motile, such as Chrysaccus sp. There are also members of this class, e.g. Chrysamoeba sp., that are amoeboid although they also go through flagellate stages.

According to Pascher's system of classification, Class Chrysophyceae is comprised of the following taxonomic orders: Chrysomonadales, Chrysocapsales, Chrysosphaerales, and Chrysotrichales. Nevertheless, further studies of the species would eventually lead to newer system of classification. The NCBI taxonomy database, for instance, cited the following as orders of Class Chrysophyceae: Chromulinales, Chrysosphaerales, Hibberdiales, Hydrurales, Phaeothamnales, and yet-to-be-classified Chrysophyceae genera.2


See also:


Reference(s):
1 Pascher, A. (1914). "Über Flagellaten und Algen ". Berichte der deutsche botanischen Gesellschaft 32: 136–160.
2 The NCBI taxonomy database. Retrieved on 2016 Feb. 26, from http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Tree&id=2825&lvl=2.