Euglena


Euglena
/yooh glee"neuh/, n.
a genus of green freshwater protozoans having a reddish eyespot and a single flagellum, found esp. in stagnant waters.
[1895-1900; < NL < Gk eu- EU- + gléne the pupil, eyeball, socket of a joint]

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▪ protist genus
 genus of single-celled organisms with both plant and animal characteristics. It is considered a member of the protozoan order Euglenida or a member of the algal division Euglenophyta. The genus is characterized by an elongated cell (15 to 500 micrometres, or 0.0006 to 0.02 inch) with one nucleus, mostly with pigment-containing chloroplasts (although some species are colourless), a contractile vacuole, an eyespot (stigma), and flagella. Certain species (e.g., E. rubra) appear red in sunlight because they contain a large amount of carotenoid pigment. Some species, which lack a rigid cellulose wall, have a flexible pellicle (envelope) that allows changes in shape. Food, absorbed directly through the cell surface or produced by photosynthesis, is stored as a complex carbohydrate (paramylum). Reproduction is asexual, by longitudinal cell division; sexual reproduction is unknown. Species of Euglena live in fresh and brackish water (water bloom) rich in organic matter. Some species develop large populations as green or red “blooms” in ponds or lakes. Several species produce resting cysts that can withstand drying. The colourless species, including some called Astasia, can be used to study cell growth and metabolism in various environmental conditions.

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Universalium. 2010.

Look at other dictionaries:

  • Euglena — Scientific classification Domain: Eukaryota Kingdom: Protista …   Wikipedia

  • Euglena — Euglena …   Wikipédia en Français

  • Euglena — Saltar a navegación, búsqueda ? Euglena Clasificación científica …   Wikipedia Español

  • euglenă — EUGLÉNĂ, euglene, s.f. Protozoar flagelat oval alungit, de apă dulce, care posedă cromatofori cu clorofilă (Euglena viridis). [pr.: e u ] – Din fr. euglène. Trimis de bogdang, 13.09.2007. Sursa: DEX 98  euglénă s. f. (sil. e u gle ), g. d. art.… …   Dicționar Român

  • Euglena —   [zu eu... und griechisch gle̅nē »Augapfel«, »Pupille«], Schönauge, Gattung der Algenklasse der Euglenophyceae mit rd. 150 Arten, die v. a. in nährstoffreichen Süßgewässern, aber auch im Brackwasser und im Meer verbreitet sind. Die mikroskopisch …   Universal-Lexikon

  • euglena — [yo͞o glē′nə] n. [ModL < EU + Gr glēnē, pupil of the eye < IE base * ĝel , * ĝlē , to gleam > CLEAN] any of a genus (Euglena) of green protists with a single flagellum, a reddish eyespot, and a flexible body shape …   English World dictionary

  • Euglēna — (E. Ehrb.), Gattung der haarlosen Infusorien, aus der Familie der Änderlinge (Astasiea), mit einem Auge, fadenförmigem Rüssel u. einem Schwanze; Arten: E. viridis, spindelförmig, grün, Augen roth, Länge 1/2 Lin.; färbt stehende Gewässer im… …   Pierer's Universal-Lexikon

  • Euglēna — Ehr., Gattung der Flagellaten, von spindelförmiger oder gestreckter Gestalt mit seiner Spiralstreifung auf der Oberfläche und Chromatophoren im Innern; die Geißel entspringt am Schlunde. Die Fortpflanzung erfolgt durch Längsteilung; häufig… …   Meyers Großes Konversations-Lexikon

  • Euglena — gracilis and E. viridis are phytoflagellate protozoa of the algal order Euglenophyta (zoological order Euglenida). An elongate cell with two flagella, one emerging from a pocket at the anterior end, the organism exhibits positive phototaxis,… …   Dictionary of molecular biology

  • euglena — euglèna ž <N mn e> DEFINICIJA rod jednostaničnih, zelenih alga …   Hrvatski jezični portal

  • Euglena — Augentierchen Euglena (1) Chloroplasten, (2) Nukleus, (3) Pyrenoid, (4) …   Deutsch Wikipedia


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