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Myzozoa [1] is a grouping of specific phyla within Alveolata, [2] [3] that either feed through myzocytosis, or were ancestrally capable of feeding through myzocytosis. [1] Many protist orders are included within Myzozoa. [1] [4] It is sometimes described as a phylum, containing the major subphyla Dinozoa and Apicomplexa, plus minor subphyla. [5]
The taxon 'Protozoa' fails to meet these standards, so grouping protozoa with animals, and treating them as closely related, became no longer justifiable. The term continues to be used in a loose way to describe single-celled protists (that is, eukaryotes that are not animals, plants , or fungi ) that feed by heterotrophy . [ 9 ]
For example, protozoa can help maintain the quality of the soil by grazing on soil bacteria. Through their grazing, the protozoa can help maintain populations of bacteria, allowing the bacteria to more efficiently decompose dead organic material which will improve the fertility of the soil .
Haemoproteus is a genus of parasitic protozoa that belong to the Apicomplexa phyla. The megaloschizont cells measured 50 to 100 micrometers. The megaloschizont cells measured 50 to 100 micrometers. The merozoites inside the megaloschizonts were less than 1 micrometer in diameter.
A protist (/ ˈ p r oʊ t ɪ s t /) is any eukaryotic organism (one with cells containing a nucleus) that is not an animal, plant, or fungus.The protists do not form a natural group, or clade, since they exclude certain eukaryotes with whom they share a common ancestor; [a] but, like algae or invertebrates, the grouping is used for convenience.
Invertebrates are a vast and very diverse group of animals that includes sponges, echinoderms, tunicates, numerous different phyla of worms, molluscs, arthropods and many additional phyla. Single-celled organisms or protists are usually not included within the same group as invertebrates.
The initial targets of Cavalier-Smith's classification, the protozoa were classified as members of the animal kingdom, [12] and many algae were regarded as part of the plant kingdom. With growing awareness that the animals and plants embraced unrelated taxa, the use of the two kingdom system was rejected by specialists.
The British protozoologist Thomas Cavalier-Smith, since 1998, developed a six-kingdom model: [f] Bacteria, Animalia, Plantae, Fungi, Protozoa and Chromista. [10] [187] In his context, paraphyletic groups take preference over clades: [10] both protist kingdoms Protozoa and Chromista contain paraphyletic phyla such as Apusozoa, Eolouka or ...