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Friday, 15 August 2014

Historical Classifications.

http://en.wikipedia.org/wiki/Protist

The first groups used to include microscopic organism were the Animalcules, and after the Infusoria.In the 1817, when the German biologist Georg August Goldfuss introduced the word Protozoa to refer to organisms such as ciliates and corals.This group was expanded in 1845 to include all unicellular animals, such as foraminifera and amoebae. The formal taxonomic category Protoctista was first proposed in the early 1860s by John Hogg, who argued that the protists should include what he saw as primitive unicellular forms of both plants and animals. He defined the Protoctista as a "fourth kingdom of nature", in addition to the then-traditional kingdoms of plants, animals and minerals.The kingdom of minerals was later removed from taxonomy by Ernst Haeckel, leaving plants, animals, and the protists as a “kingdom of primitive forms”.

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