Euglenophyta


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Euglenophyta

(yo͞o'glənŏf`ətə), small phylum (division) 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 mostly unicellular aquatic algaealgae
[plural of Lat. alga=seaweed], a large and diverse group of primarily aquatic plantlike organisms. These organisms were previously classified as a primitive subkingdom of the plant kingdom, the thallophytes (plants that lack true roots, stems, leaves, and flowers).
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. Most live in freshwater; many have flagella and are motile. The outer part of the cell consists of a firm but flexible layer called a pellicle, or periplast, which cannot properly be considered a cell wall. Some euglenoids contain chloroplastschloroplast
, a complex, discrete green structure, or organelle, contained in the cytoplasm of plant cells. Chloroplasts are reponsible for the green color of almost all plants and are lacking only in plants that do not make their own food, such as fungi and nongreen parasitic
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 that contain the photosynthetic pigments chlorophyll a and b, as in the phylum ChlorophytaChlorophyta
, phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as green algae. The organisms are largely aquatic or marine.
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; others are heterotrophic and can ingest or absorb their food. Food is stored as a polysaccharide, paramylon. Reproduction occurs by longitudinal cell division. The most characteristic genus is Euglena, common in ponds and pools, especially when the water has been polluted by runoff from fields or lawns on which fertilizers have been used. There are approximately 1,000 species of euglenoids.

Euglenophyta

 

a division of microscopic algae usually consisting of a single free-swimming cell. Colonial forms are rare. The nucleus is clearly pronounced, and the green, rarely colorless, chloroplast may lack pyrenoids. The plastmatic cover, or periplast, of some species bears hard, iron-incrusted capsules. At the anterior end of the cell there is a gullet, through which one, two, or sometimes more flagella extend. The contracting vacuoles and stigma are located on the sides of the gullet. In creeping forms the flagellum is rudimentary. Reproduction is by means of longitudinal splitting. Under unfavorable conditions, some species discard their flagella and form protective spores (cysts). Nutrition is primarily phototrophic in green individuals and saprophytic and holozoic (according to the animal type) in colorless individuals. Parasitic species are few in number. The carbohydrate paramylum and oil serve as a food reserve.

There are about 60 genera, embracing more than 900 species, usually found in shallow reservoirs rich in organic matter. The USSR has 33 genera, with 429 species. The algae give water a green, red, or brown coloration when they grow abundantly. Many zoologists classify the Euglenophyta among the Protozoa.

REFERENCE

Popova, T. G., and T. A. Safonova. Evglenovye vodorosli, Leningrad, 1976.

L. A. RUNDINA

Euglenophyta

[‚yü·glə′näf·əd·ə]
(botany)
A division of the plant kingdom including one-celled, chiefly aquatic flagellate organisms having a spindle-shaped or flattened body, naked or with a pellicle.
References in periodicals archive ?
Species axis 2 was positively related to WT, TN and the biomasses of Cyanophyta, Chlorophyta, Bacillariophyta, Euglenophyta, Cryptophyta, and Xanthophyta (Fig.
En esta fase, la riqueza nuevamente disminuyo y como resultado en cada muestreo dominaron entre dos o tres especies de los phyla Euglenophyta y Chlorophyta.
Este platelminto "autotrofo", de 305-421 um de longitud, se encontro en la columna de agua, con abundancias relativas de hasta 38%, principalmente en la localidad denominada "La Naval", durante gran parte del bienio 2009-2010, donde tambien fue comun hallar representantes de Euglenophyta.
Generalmente, las Euglenophyta son consideradas buenas indicadoras de la concentracion de materia organica y, por ende, de las diferentes formas del carbono organico presente en un cuerpo de agua (Sladecek & Perman 1978, Wetzel 2000, Reynolds et al.
Junio 2004 - abril 2009 Division Riqueza total Bacillariophyta 35 Chrysophyta 5 Chlorophyta 86 Cyanophyta 34 Euglenophyta 6 Pyrrhophyta 3 Rodophyta 1 Total 170 Tabla 3.
En este mes Chlorophyta abarco el 33% de los individuos reportados, seguido de Cyanophyta (26%), Heterokonthophyta (22%), Euglenophyta (13%), Xanthophyta (5%) y Pyrrophyta (1%).
Já os taxons Cyanobacteria, Chrysophyta e Euglenophyta, representaram menos de 0,5% do total observado no trato digestório (Figura 1, Tabela 2,).
Especially well-succeeded colonizers belong to Euglenophyta and Chlorophyta (Euglena mutabilis and Kleb sormidium sp.
minimum Hansirg X X Treubaria schmidlei (Schroder) Fott & Kovacic EUGLENOPHYTA Colacium vesiculosum Ehrenberg Euglena ehrenbergii Klebs Lepocinclis salina Fritsch X X L.
Cyanophyta (11 species), Heterokontophyta (8 species), Cryptophyta (3), Pyrrhophyta (2 species), and Euglenophyta (1 species) also contributed to phytoplankton, but they were represented by fewer species.
Algae are classified into different division (phylum) namely Chlorophyta, Charophyta, Phaeophyta, Rhodophyta, Bacillariophyta, Xanthophyta, and Euglenophyta.
A total of 184 taxa from eight Divisions (Chlorophyta, Bacillariophyta, Euglenophyta, Dinophyta, Chrysophyta, Xanthophyta, Cryptophyta and Cyanobacteria) were encountered in the rivers.