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 ?
Species axis 1 was positively correlated with SD and Chrysophyta biomass but negatively correlated with TP (Fig.
(a) Chlorophyta 42.3% Bacillariophyta 19.2% Pyrrophyta 2.6% Xanthophyta 2.6% Euglenophyta 9.0% Cryptophyta 6.4% Cyanophyta 14.1% Chrysophyta 3.8% (b) Chlorophyta 52.3% Bacillariophyta 5.5% Pyrrophyta 2.8% Xanthophyta 1.8% Euglenophyta 13.8% Cryptophyta 3.7% Cyanophyta 19.3% Chrysophyta 0.9%
Silica-scaled Chrysophyceae and Synurophyceae (Chrysophyta) from Mississippi.
The cyanobacteria accounted for ten species, followed by the Chlorophyta with four species and the Chrysophyta with one species.
The Lake Daihai is a typical algal-dominated lake, and there are about 121 species and 76 genera of algae of which belong to Chlorophyta (28 genera), Bacillariophyta (21 genera), Cyanophyta (9 genera), Euglenophyta (7 genera), and other algae including Pyrrophyta, Cryptophyta, and Chrysophyta [30].
Spatial-temporal variation in phytoplankton: The phytoplankton was made up of 53 species and one variety: Chlorophyta (45.28%), Cyanophyta (30.19%), Bacillariophyta (15.09%), Euglenophyta (3.77%), Cryptophyta (3.77%) and Chrysophyta (1.89%).
La mayor diversidad fue observada en Chlorophyta, seguido por Bacillariophyta y Cyanophyta, mientras que Rhodophyta, Pyrrhophyta y Chrysophyta presentaron valores minimos (Tabla 2).
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.
Chapman considers the haptophytes or prymnesiophytes, and diatoms or Bacillariophyta as two independent types of protoctists, and includes the silicoflagellates as a class within the Chrysophyta (also considered as a separate phylum), called the Dictyochophyceae.
- Chrysophyta and Cryptophyta taxa dominated the phytoplankton at the start of the experiment in all enclosures and throughout the summer in the control enclosures ([ILLUSTRATION FOR FIGURE 4 OMITTED], Plate 1, Appendix I).
Zygnemaphyta was the most specious group (94 taxa), followed by Chlorophyta (77 taxa), Bacillariophyta (71 taxa), Cyanophyta (20 taxa), Euglenophyta (12 taxa), Chrysophyta (5 taxa), Dinophyta (2 taxa), Cryptophyta (1 taxa) and Xanthophyta (1 taxa).