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ProtoctistaenUK
Thesaurus| Noun | 1. | Protoctista - 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 from plants and animalskingdom Protoctistaprotoctist order - the order of protoctistsprotoctist - any of the unicellular protistsdivision Protista, Protista - eukaryotic one-celled living organisms distinct from multicellular plants and animals: protozoa, slime molds, and eukaryotic algaeprotoctist family - any of the families of Protoctistaprotoctist genus - any genus of Protoctistaphylum Protozoa, Protozoa - in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifersdivision Heterokontophyta, Heterokontophyta - algae having chlorophyll a and usually c, and flagella of unequal lengths; terminology supersedes Chrysophyta in some classificationsChrysophyta, division Chrysophyta - mostly freshwater eukaryotic algae having the chlorophyll masked by brown or yellow pigment; yellow-green and golden-brown algae and diatoms: Xanthophyceae, Chrysophyceae, Bacillariophyceae; some classification systems superseded or subsumed by Heterokontophytadivision Euglenophyta, Euglenophyta - free-swimming flagellate algaeChlorophyta, division Chlorophyta - large division of chiefly freshwater eukaryotic algae that possess chlorophyll a and b, store food as starch, and cellulose cell walls; classes Chlorophyceae, Ulvophyceae, and Charophyceae; obviously ancestral to land plantsdivision Rhodophyta, Rhodophyta - lower plants; mostly marine and littoral eukaryotic algaeCryptophyta, phylum Cryptophyta - a phylum in the kingdom Protoctistakingdom - the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia |
EncyclopediaSeeProtistaProtoctistaenUK
Pro·toc·tis·ta (prō'tok-tis'tă), 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 Protoctista 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 Protoctista replaces the term Protista, which connotes single-celled or acellular organisms, whereas the basal preplant (Protophyta) and preanimal (Protozoa) assemblages incorporated in Protoctista include many multicellular forms, because multicellularity appears to have evolved independently a number of times within these primitive groups. [G. prōtos, the first, + ktizō, to establish] Pro·toc·tis·ta (prō'tok-tis'tă) 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 fungi. Included are the nucleated algae and seaweeds, the flagellated water molds, slime molds and nets, and protozoa; unicellular, colonial, and multicellular organisms are included, but the complex development of tissues and organs of plants and animals is absent. [G. prōtos, the first, + ktizō, to establish]Protista or Protoctista the kingdom, in older CLASSIFICATIONS, which contains eukaryotic, mostly unicellular, organisms, including ALGAE, diatoms (BACILLARIOPHYCEAE), PROTOZOANS and slime moulds.ProtoctistaenUK
Synonyms for Protoctistanoun in most modern classifications, replacement for the ProtistaSynonymsRelated Words- protoctist order
- protoctist
- division Protista
- Protista
- protoctist family
- protoctist genus
- phylum Protozoa
- Protozoa
- division Heterokontophyta
- Heterokontophyta
- Chrysophyta
- division Chrysophyta
- division Euglenophyta
- Euglenophyta
- Chlorophyta
- division Chlorophyta
- division Rhodophyta
- Rhodophyta
- Cryptophyta
- phylum Cryptophyta
- kingdom
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