Protoctista

Protoctista
A kingdom of eukaryotes incorporating the algae and the protozoans that comprise the presumed ancestral stocks of the fungi, plant, and animal kingdoms; they lack the developmental pattern stemming from a blastula, typical of animals, the pattern of embryo development typical of plants, and development from spores as in the fungi. Included in P. are the nucleated algae and seaweeds, the flagellated water molds, slime molds, and slime nets, and the protozoa; unicellular, colonial, and multicellular organisms are included, but the complex development of tissues and organs of plants and animals is absent. The term P. replaces the term Protista, which connotes single-celled or acellular organisms, whereas the basal pre-plant (Protophyta) and pre-animal (Protozoa) assemblages incorporated in P. include many multicellular forms, since multicellularity appears to have evolved independently a number of times within these primitive groups. [G. protos, the first, + ktizo, to establish]

Medical dictionary. 2011.

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  • Protoctista — Als Protoctisten (Protoctista) werden alle eukaryotischen Lebewesen bezeichnet, die nicht zu den Tieren, Pflanzen oder Pilzen gehören. Es ist demnach ein systematischer Begriff im Rang eines Reichs, ist allerdings kein Taxon im phylogenetischen… …   Deutsch Wikipedia

  • Protoctista — noun in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct… …   Useful english dictionary

  • protoctista — pro·toc·tì·sta s.m. TS biol. organismo del regno dei Protoctisti, unicellulare o pluricellulare ed eucariote | pl. con iniz. maiusc., nelle attuali classificazioni, una delle sei maggiori categorie tassonomiche in cui sono suddivisi gli esseri… …   Dizionario italiano

  • kingdom Protoctista — noun in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct… …   Useful english dictionary

  • Protist — Taxobox | color = khaki name = Protist fossil range = Neoproterozoic Recent image width = 250px image caption = domain=Eukarya domain authority=Whittaker Margulis, 1978 regnum = Protista* regnum authority = Haeckel, 1866 subdivision ranks =… …   Wikipedia

  • Protoctisten — Als Protoctisten (Protoctista) werden alle eukaryotischen Lebewesen bezeichnet, die nicht zu den Tieren, Pflanzen oder Pilzen gehören. Es ist demnach ein systematischer Begriff im Rang eines Reichs, ist allerdings kein Taxon im phylogenetischen… …   Deutsch Wikipedia

  • Treatise on Invertebrate Paleontology — The Treatise on Invertebrate Paleontology (or TIP) published by the Geological Society of America and the University of Kansas Press, is a definitive multi authored work of some 50 volumes, written by more than 300 paleontologists, and covering… …   Wikipedia

  • Protista — Saltar a navegación, búsqueda ? Protista Paramecium aurelia, un ciliado Clasificación científic …   Wikipedia Español

  • Protozoo — Saltar a navegación, búsqueda Amoeba, una ameba …   Wikipedia Español

  • Life — For other uses, see Life (disambiguation). Life (Biota / Vitae / Eobionti) …   Wikipedia

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