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PROTISTA , a name invented by See also:Ernst See also:Haeckel (Generelle See also:Mar phologie der Organismen, 1866) to denote a See also:group of organisms supposed to be intermediate between the See also:animal and See also:vegetable kingdoms . As knowledge advanced the precise limits of the group shifted, and Haeckel himself, in successive publications, placed different sets of organisms within it, at one See also:time proposing to include all unicellular animals and See also:plants, making it a third See also:kingdom See also:equivalent to the animal and vegetable kingdoms . Partly because the See also:term represented an See also:interpretation rather than an See also:objective set of facts, the word Protista has not been generally accepted for use in See also:classification, and, whilst recognizing that the limits of the animal and plant kingdoms are not sharply defined, See also:modern systematists refrain from associating these doubtfully placed organisms simply because of the dubiety of their position . |
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