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He discovered and gave names to thousands of species, and he proposed the existence of a distinct biological kingdom: Protista, organisms that can’t be categorized as animal, plant or fungus.

Such forms are said to have a “distributed” nucleus, and among the Protozoa correspond to Haeckel’s “Protista.”

This is to be called Protista, and is to include all the doubtful forms that are not clearly members either of the Kingdom Animalia or of the Kingdom Vegetabilia.

They enlarge and diminish, and are possibly excretory like the “contractile vacuoles” of other Protista; though it has been suggested that by their communication with the medium they subserve nutrition.

Thus, in biology, we used to have interminable discussion as to whether certain single-celled organisms were animals or vegetables, until Haeckel introduced the new apperceptive name of Protista, which ended the disputes.