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Protozoa ( sg.: protozoan or protozoon; alternative plural: protozoans) are a polyphyletic group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic debris. [1] [2] Historically, protozoans were regarded as "one-celled animals".
Apr 28, 2017 · Below is an image of a ciliate protozoa. Organisms known as protozoa include a wide range of organisms, most of which are free-living single-celled eukaryotes. Therefore, protozoa fit into the Domain Eukarya.
Apr 10, 2024 · protozoan, organism, usually single-celled and heterotrophic (using organic carbon as a source of energy), belonging to any of the major lineages of protists and, like most protists, typically microscopic. All protozoans are eukaryotes and therefore possess a “true,” or membrane-bound, nucleus.
Aug 3, 2023 · The size and shape of Protozoa vary greatly, from 1µm to 50 µm. However, the largest, Balantidium coli, may measure 150 μm. Protozoa are unicellular, having a eukaryotic cell structure with a well-developed nucleus and membrane-bound cell organelles such as mitochondria, Golgi bodies, and lysosomes.
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The Protozoa are considered to be a subkingdom of the kingdom Protista, although in the classical system they were placed in the kingdom Animalia. More than 50,000 species have been described, most of which are free-living organisms; protozoa are found in almost every possible habitat.
- Robert G. Yaeger
- 1996
- 1996
Aug 3, 2023 · There are about 50,000 known species of Phylum Protozoa. Protozoans exhibit mainly two forms of life; free-living (aquatic, freshwater, seawater) and parasitic (ectoparasites or endoparasites). They are also commensal in habitat. They are small, usually microscopic, not visualize without a microscope. They are the simplest and primitive of all ...
Protozoa (in Greek proto = first and zoa = animals) is a diverse group of single- celled, microscopic or near-microscopic eukaryotes ( organisms whose cells have nuclei) that commonly show characteristics usually associated with animals, most notably mobility and heterotrophy.
