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Stentor (protozoa)
''Stentor'', sometimes called trumpet animalcules, are a genus of filter-feeding, heterotrophic ciliate protists, representative of the heterotrichs. They are usually horn-shaped, and reach lengths of two millimeters; as such, they are among the biggest known extant unicellular organisms. They reproduce asexually through binary fission.
==Description==
The body, or cortex, is generally horn-shaped, hence the association with the Greek herald and the former name "trumpet animalcule", with a ring of prominent cilia around the anterior "bell" that sweep in food and aid in swimming. Some reach several millimeters in length, making them among the largest single celled organisms. ''Stentor'' can come in different colors. For example, ''S. coeruleus'' can appear blue due to the presence of Stentorin, a natural pigment. As in many freshwater protozoans, ''Stentor'' has a contractile vacuole. Because the concentration of salt inside the cell and in the surrounding freshwater is different, ''Stentor'' must store water that enters it by osmosis and then discharge it from the vacuole. They can regenerate, and small fragments can grow into full organisms. Each cell has one (often elongated) macronucleus and several micronuclei.
File:Mikrofoto.de-Stentor-1.jpg|''Stentor polymorphus with algal symbionts''
File:Mikrofoto.de-Stentor-4.jpg|''Stentor polymorphus with algal symbionts''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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