Chlamydomonas

Chlamydomonas
Genus of single-celled green algae considered to be primitive life-forms of evolutionary significance.

The cell has a spherical cellulose membrane, an eyespot, and a cup-shaped, pigment-containing chloroplast. Though capable of photosynthesis, Chlamydomonas may also absorb nutrients through the cell surface. It is found in soil, ponds, and ditches polluted by manure. It may colour water green. A red-pigmented species turns melting snow red.

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▪ genus of algae
 genus of green biflagellated single-celled organisms of disputed classification, placed botanically in the green algal order, Volvocales, and zoologically in the plantlike protozoan order, Volvocida. Chlamydomonas is considered a primitive life-form of evolutionary significance. The more or less oval cells have a cellulose membrane (theca), a stigma (eyespot), and a usually cup-shaped, pigment-containing chloroplast. Although photosynthesis occurs, nutrients also may be absorbed through the cell surface. Asexual reproduction is by zoospores; sexual reproduction is by formation of gametes. The development of motility, sexual differentiation, and gamete fusion seems dependent on the production of substances (termones, gamones) that have a regulatory action similar to hormones. There are some 500 species of Chlamydomonas, found in soil, ponds, and ditches, where they may colour water green. One species, C. nivalis, which contains the red pigment hematochrome, sometimes imparts a red colour to melting snow.

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Universalium. 2010.

Look at other dictionaries:

  • Chlamydomonas — Chlamydomonas …   Wikipédia en Français

  • Chlamydomonas — SEM image of flagellated Chlamydomonas (10000×) Scientific classification Kingdom …   Wikipedia

  • Chlamydomonas — sp. Systematik ohne Rang: Chloroplastida Abteilung: Chlorophyta …   Deutsch Wikipedia

  • chlamydomonas — ● chlamydomonas nom féminin Algue unicellulaire d eaux douces, très commune, munie de deux flagelles lui permettant une nage active. chlamydomonas [klamidɔmɔnas] n. f. ÉTYM. 1845, sous la forme chlamydomonade; lat. sc., du grec khlamus, udos (→… …   Encyclopédie Universelle

  • Chlamydomonas — n. the type genus of the {Chlamydomonadaceae}; they are solitary biflagellated plantlike algae common in fresh water and damp soil. They multiply freely and are often a pest around filtration plants. Syn: genus {Chlamydomonas}. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • Chlamydomonas —   [ç ], einzellige, zweigeißlige Grünalgengattung aus der Ordnung der Volvocales; der grüne Chloroplast trägt einen Augenfleck; einige Arten können durch Sekundärcarotinoide rot gefärbt sein. Chlamydomonas kommt im Süß , Meerwasser und im Boden… …   Universal-Lexikon

  • Chlamydomŏnas — Chlamydomŏnas, Geschlecht der Räderthierchen; ohne Schwanz, 2 Rüssel, 1 Auge; Art: Ch. pulvisculus, eiförmig, grün, Auge roth, krugförmige Hülle, färbt im Frühjahr u. Herbst die Wasserbehälter grün …   Pierer's Universal-Lexikon

  • Chlamydomonas — Chlamydomonas …   Wikipédia en Français

  • Chlamydomonas —   Chlamydomonas …   Wikipedia Español

  • chlamydomonas — [ˌklamɪdə məʊnəs] noun Biology a common single celled green alga living in water and moist soil. [Genus Chlamydomonas.] Origin C19: mod. L., from Gk khlamus, khlamud cloak + monas (see monad) …   English new terms dictionary

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