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protistan
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The answer PROTISTAN has 0 possible clue(s) in existing crosswords.
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Definitions of protistan in various dictionaries:
noun - free-living or colonial organisms with diverse nutritional and reproductive modes
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Keep reading for additional results and analysis below.
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| Of or pertaining to the protists |
| free-living or colonial organisms with diverse nutritional and reproductive modes |
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A protist () is any eukaryotic organism (one with cells containing a nucleus) that is not an animal, plant or fungus. The protists do not form a natural group, or clade, since they exclude certain eukaryotes; but, like algae or invertebrates, they are often grouped together for convenience. In some systems of biological classification, such as the popular five-kingdom scheme proposed by Robert Whittaker in 1969, the protists make up a kingdom called Protista, composed of "organisms which are unicellular or unicellular-colonial and which form no tissues".Besides their relatively simple levels of organization, protists do not necessarily have much in common. When used, the term “protists” is now considered to mean a paraphyletic assemblage of similar-appearing but diverse taxa (biological groups); these taxa do not have an exclusive common ancestor beyond being composed of eukaryotes, and have different life cycles, trophic levels, modes of locomotion, and cellular structures. * In the classification system of Lynn Margulis, the term protist is reserved for microscopic organisms, while the more inclusive term Protoctista is applied to a biological kingdom which includes certain large multicellular eukaryotes, such as kelp, red algae and slime molds. Others use the term protist more broadly, to encompass both microbial eukaryotes and macroscopic organisms that do not fit into the other traditional kingdoms. * In cladistic systems (classifications based on common ancestry), there are no equivalents to the taxa Protista or Protoctista, both terms referring to a paraphyletic group which spans the entire eukaryotic tree of life. * In cladistic classification, the contents of Protista are distributed among various supergroups (SAR such as amoebas, protozoa and some algae, Archaeplastida such as land plants and some algae, Excavata, which are a group of unicellular organisms, Opisthokonta such as animals and fungi, etc.) and "Protista", ''Protoctista'' and "Protozoa" are considered obsolete. However, the term "protist" continues to be used informally as a catch-all term for unicellular eukaryotic microorganisms. For example, the word "protist pathogen" may be used to denote any disease-causing microbe which is not bacteria, virus, viroid or metazoa. |