Chrysophyta


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Related to Chrysophyta: Chlorophyta, division Chrysophyta, Pyrrophyta

Chrysophyta

(krəsŏf`ətə), phylum (division) of unicellular marine or freshwater organisms of the kingdom ProtistaProtista
or Protoctista
, in the five-kingdom system of classification, a kingdom comprising a variety of unicellular and some simple multinuclear and multicellular eukaryotic organisms.
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 consisting of the diatomsdiatom
, unicellular organism of the kingdom Protista, characterized by a silica shell of often intricate and beautiful sculpturing. Most diatoms exist singly, although some join to form colonies.
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 (class Bacillariophyceae), the golden, or golden-brown, algae (class Chrysophyceae), and the yellow-green algae (class Xanthophyceae). In many chrysophytes the cell walls are composed of cellulose with large quantities of silica. Some have one or two flagella, which can be similar or dissimilar. A few species are ameboid forms with no cell walls. The food storage products of chrysophytes are oils or the polysaccharide laminarin. Formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c; all but the yellow-green algae also contain the carotenoid pigment fucoxanthin. Under some circumstances diatoms will reproduce sexually, but the usual form of reproduction is cell division. The diatoms and golden-brown algae are of great importance as components of the plankton and nanoplankton that form the foundation of the marine food chain.

Chrysophyta

[krə′säf·ə·də]
(botany)
The golden-brown algae, a division of plants with a predominance of carotene and xanthophyll pigments in addition to chlorophyll.
References in periodicals archive ?
Chlorophyta and Chrysophyta were the dominant taxa in the phytoplankton of Shelby Creeks.
Koch (1976) recorded 91 taxa of Chlorophyta, 64 of Cyanophyta, 6 of Chrysophyta (excluding diatoms), and 1-3 each of Pyrrhophyta, Euglenophyta, and Xanthophyta.
Moreover, remarkable level of flagellate biomarker in both species suggested the importance of flagellates (mainly including species in Chrysophyta and Pyrrophyt) in the diet of two intertidal bivalves.