Archaeocytes
- Archaeocytes
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Les archaeocytes (ou archéocytes)(du grec archaios "commençant" et kytos "vaisseau creux") (à ne pas confondre avec les Archaeocyatha qui vécurent du début du Cambrien jusqu'à la fin de la faune de Burgess), sont des cellules-souches présentes chez les Porifères qui ont la capacité de se différencier en cellules spécialisées (choanocytes, porocytes, pinacocytes…).
Situées dans le mésohyle, ils constituent l'une des synapomorphies des Porifères. Dans le cas de la reproduction sexuée, ce sont ces cellules-souches qui peuvent se différencier en gamètes femelles.
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archaeocytes — n. pl. [Gr. arche, beginning; kytos, container] 1. (PORIFERA) Large, wandering amoebocytes with multiple phagosomes in the mesenchyme; nurse cells; trophocytes. 2. A totipotent amoeboid cell … Dictionary of invertebrate zoology
archaeocytes — n. type of cell found in sponges (Zoology) … English contemporary dictionary
Archaeocyte — Archaeocytes (from Greek beginning and hollow vessel ) or amoebocytes are amoeboid cells found in sponges. They are totipotent and have varied functions depending on the species.LocationArchaeocytes are located in the mesohyl, an acellular… … Wikipedia
sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… … Universalium
Sponge — This article is about the aquatic animal. For the porous cleaning tool, see Sponge (material). For other uses, see Sponge (disambiguation). Sponge Temporal range: Ediacaran–Recent … Wikipedia
archeocyte — see archaeocytes … Dictionary of invertebrate zoology
cercid — n. [Gr. kerkis, shuttle] (PORIFERA) A minute migrating cell produced by division of the archaeocytes … Dictionary of invertebrate zoology
gemmule — n. [L. gemma, bud] 1. A bud like outgrowth that becomes an independent individual. 2. (PORIFERA) Composed of a mass of archaeocytes charged with reserves and enclosed in a non cellular protective envelope. 2. Historically a particle of heredity,… … Dictionary of invertebrate zoology
nurse cells — 1. Cells of developing oocytes that provide material for further growth; trophocytes. 2. (ARTHROPODA: Insecta) In some species, the nurse cells synthesize nucleic acids and possibly protein and supply them to the oocyte via intercytoplasmic… … Dictionary of invertebrate zoology
thermotaxis — n. [Gr. therme, heat; taxis, arrangement] A taxis in which heat is the response initiating stimulus; regulation of body temperature. thesocytes n. pl. [Gr. thesis, deposit; kytos container] (PORIFERA) In hibernating fresh water sponge gemmules,… … Dictionary of invertebrate zoology
