The Xanthophyta or Heterokontae are commonly known as yellow-green algae include only one class Xanthophyceae. This division has close relationship with. Xanthophyta (yellow-green algae) A division of algae in which the chloroplasts are yellow-green and which form motile cells with 1 long, forward-directed tinsel. Xanthophyta: Xanthophyta, division or phylum of algae commonly known as yellow-green algae.
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The oogonia are single or in groups, producing single egg, which is fertilized in place and develops thick walls to form an oospore.
Genera include Botrydium and Vaucheria. These protoplasts become metamorphosed into pear-shaped zoospores which bear two anteriorly placed unequal flagella. Occurrence and Reproduction Fungi.
InAllorge renamed the group as Xanthophyceae. Contact our editors with your feedback.
Other Xanthophyceae Classes are Tribonema, whose structure consists of unbranched filaments; Botrydiopsis, such as the species Botrydium with several thalli, each thallus formed by a large aerial vesicle and rhizoidal filaments, found in damp soil; Olisthodiscus, such as the species Ophiocytium with cylindrical and elongated multinucleated cells and multiple chloroplasts.
Food reserve is oil. Cross-walls, however, occur only in the event of injury or in connection with the formation of reproductive organs.
This page was last edited on 30 Julyat Volume 4 Tribophyceae Xanthophyceae. Xanthophyta yellow- green algae A division of algae in which the chloroplasts are yellow-green and which form motile cells with 1 long, forward-directed tinsel flagellum and 1 much shorter, backward-directed whiplash flagellum. In spite of his own dislikeness, Fritsch placed Vaucheria in the family Vaucheriaceae under the order Siphonales belonging xanthkphyta the Chlorophyceae.
The plastids have four membranes and their yellow-green color is due to the presence of beta-carotene and xanthins, such as vaucheriaxanthin, diatoxanthin, diadinoxanthin, and heretoxanthin, but not fucoxanthin, the brown pigment present in other Chromista. It comprises a single species,…. Cite this article Pick a style below, and copy the text for your bibliography.
Xanthophytes occur in a variety of forms — unicellular, colonial, filamentous, and siphonaceous; motile cells have two unequal-sized undulipodia flagella. In the classification of Smiththere are six orders in the class Xanthophyceae, placed in the division Chrysophyta:.
Due xanthophta the presence of excess of carotinoids, the colour of chromatophores is yellow-green. Horse, Equus caballusa hoofed herbivorous mammal of the family Equidae.
Asexual reproduction is by zoospores produced singly in sporangia formed at the tips of branches. Xanthophytadivision or phylum of algae commonly known as yellow-green algae q. Cambridge University Press, Cambridge. When exposed to drought the protoplasmic contents of the vesicle migrate into the rhizoids and divide to form thick-walled globose to ellipsoid coenocysts also known as cysts, which either germinate directly or produce zoospores Fig. The zoospores are multiflagellate, the flagella in pairs over the whole surface.
Animal, kingdom Animaliaany of a group of multicellular eukaryotic organisms i. You can learn more about this topic in the related articles below. An illustrated Guide to Protozoa. Wikispecies has information related to Xanthophyceae. Examples of xanthophytes repair the unequal flagella in the cells.
Retrieved December 26, from Encyclopedia. The zoospores are characterized for having two unequal flagella borne at the anterior end or are multi-flagellate. There are varied forms of vegetative body ranging from unicellular coccoid, siphonaceous to filamentous condition.
Your contribution may be further edited by our staff, and its publication is subject to our final approval. An Introduction to the Study of Algae. Modern Language Association http: Seaweeds of the British Isles. The shape of the aerial portion is considerably influenced by environmental conditions.
Yellow-green algae – Wikipedia
The cell contains one to several discoid chromatophores. One line may have developed from an unicellular motile ancestry giving rise to non-motile unicells which may be solitary or colonial.
Bigyromonadea Bicosoecea Sagenista Labyrinthulomycetes Eogyrea.