As a group the protozoa are most primitive and are inhabiting the earth for about a billion and half years. Fossil forms of radiolaria and foraminiferans, half a billion years old, have been recorded. Origin: Pre-Cambrian Taxonomic Retrospect: Leeuwenhock (1676) first gave preliminary accounts of some protozoan forms after the discovery of microscope. Goldfuss (1818) […]
Protozoan: Definition, Features and Its Classification
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