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Protozoa Definition. 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. Although the different phyla of the kingdom Protista are not closely related, they are nonetheless classified together because of their large differences from the other kingdoms of plants, animals and fungi.


Protozoa (also protozoan, plural protozoans) is an informal term for single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris. Historically, the protozoa were regarded as "one-celled animals", because they often possess animal-like behaviors, such as motility and predation, and lack a cell wall, as ...


Explanation of Protozoa in the largest biology dictionary online. Free learning resources for students covering all major areas of biology.


Scientists widely believe that animals evolved from protozoan ancestors, probably colonial choanoflagellates. New tools and methods from molecular biology are leading to a better understanding of the evolutionary relationships to multicellular organisms and among protozoa.


Protozoa are a diverse group of organisms that are non-phototrophic, unicellular, eukaryotic microorganisms with no cell walls. In general, protozoa have different stages in their lifecycles.


Protozoa are single-celled organisms without cell walls. They are believed to be a part of the microbial world as they are unicellular and microscopic. There is a great deal to know about their classification, characteristics and more.


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. The fossil record in the form of shells in sedimentary rocks shows that protozoa were present in the Pre ...


Reproduction in Protozoa: Protozoa reproduce by both asexual and sexual means, though sexual reproduction is less common and occurs in certain groups. Most protozoa reproduce asexually by cell division producing two equal or sometimes unequal cells. The cell division in certain protozoa is longitudinal, while in others transverse.


Education and information about Nonpathogenic (Harmless) Intestinal Protozoa biology and life cycle. Education and information about Nonpathogenic (Harmless) Intestinal Protozoa biology and life cycle. Skip directly to site content Skip directly to page options Skip directly to A-Z link.