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Paramecium (/ ˌ p ær ə ˈ m iː s (i) ə m / PARR-ə-MEE-s(ee-)əm, /-s i ə m /-see-əm, plural "paramecia" only when used as a vernacular name) [2] is a genus of eukaryotic, unicellular ciliates, widespread in freshwater, brackish, and marine environments. Paramecia are often abundant in stagnant basins and ponds.
Paramecium Müller, 1773; Physanter Jankowski, 1975; Parameciidae is a family of ciliates in the order Peniculida. Members of this family have differentiated anterior ...
Paramecia are found in freshwater environments, and are especially in scums. Paramecia are attracted by acidic conditions, since they eat bacteria , which often acidify their surroundings. They are an important link in the detrital food web in aquatic ecosystems , eating bacteria and dead organic matter often associated with these bacteria, and ...
In paramecium, the anal pore is a region of pellicle that is not covered by ridges and cilia, and the area has thin pellicles that allow the vacuoles to be merged into the cell surface to be emptied. In ciliates , the anal cytostomes and cytopyge pore regions are not covered by either ridges or cilia or hard coatings like the other parts of the ...
Paramecium bursaria is a species of ciliate found in marine and brackish waters. [1] It has a mutualistic endosymbiotic relationship with green algae called Zoochlorella . About 700 Chlorella cells live inside the protist's cytoplasm and provide it with food, while the Paramecium provides the algae with movement and protection. [ 2 ]
Paramecium biaurelia is a species of unicellular ciliates under the genus Paramecium, and one of the cryptic species of Paramecium aurelia. [2] It is a free-living protist in water bodies and harbours several different bacteria as endosymbionts.
The best-understood contractile vacuoles belong to the protists Paramecium, Amoeba, Dictyostelium and Trypanosoma, and to a lesser extent the green alga Chlamydomonas. Not all species that possess a contractile vacuole are freshwater organisms ; some marine , soil microorganisms and parasites also have a contractile vacuole.
Sonneborn went on to study the cortical structure of Paramecium and demonstrated that "preexisting structure controls the way new structures are formed in the cortex of ciliated protozoans", a phenomenon he called cytotaxis. This structural inheritance was a new phenomenon in genetics, and could be applied to all types of organisms.