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 Cyanophyta but negatively correlated with Cryptophyta and Chrysophyta (Fig.
The relative proportions of Chlorophyta, Cryptophyta, and Chrysophyta were significantly affected by fertilization (Table 3).
In the control enclosures, as in the deep controls, Chrysophyta was the most important algal division with Chlorophyta contributing [less than]20% of total biomass ([ILLUSTRATION FOR FIGURE 6 OMITTED] and Plate 1).
A total of 173 infrageneric taxa were identified, distributed among the following divisions: Dinophyta (103 taxa), Bacillariophyta (61 taxa), Cyanobacteria (7 taxa), Chlorophyta and Chrysophyta (1 taxon).
cinctum A513 Peridinium pusillum (Penard) 4 3 Lemmermann A516 Peridiniopsis cunningtonii 4 4 3 Lemmermann A517 Peridiniopsis polonicum 4 1 2 (Woloszynska) Bourrelly Familia Glenodiniopsidaceae Schiller A493 Glenodinium kulczynskii 4 2 3 (Woloszynska) Schiller Division: Chrysophyta Familia Chromulinaceae Engler in Engler et Prantl A75 Monochrysis lutheri Dop 4 3 2 3 Familia Ochromonadaceae Lemmermann A77 Ochromonas variabilis Meyer 4 1 2 2 Familia Rhizochloridaceae Pascher em.
2000) and Richards (2001) also reported the presence of algae, from divisions such as Cyanobacteria, Chrysophyta, Euglenophyta, Chlorophyta and Pyrrophyta.
The Chrysophyta, mainly diatoms, were the most abundant (56 % of the total), followed by Clorophyta (29 %), Cyanophyta (11 %) and Cryptophyta (4 %).
2 CHLOROPHYTA CHRYSOPHYTA OEDOGONiACEAE HETEROCLONiACEAE Oedogonium sp.
En el resto de la laguna de mayor influencia marina dominan las Bacillariophyta; sin embargo, en la zona de la darsena debido a la combinacion de descargas de agua dulce, aportes de materia organica y menor transparencia, los grupos Chrysophyta y Cryptophyta son relativamente importantes.