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Dileptus margaritifer
''Dileptus margaritifer'' (Ehrenberg, 1833) is a unicellular ciliate protozoan in the family ''Dileptidae.'' It is common in freshwater streams, lakes and ponds, as well as mosses and soil. The species has been found on every continent except Antarctica.〔Vďačný, Peter, and Wilhelm Foissner. Monograph of the dileptids (Protista, Ciliophora, Rhynchostomatia). Land Oberösterreich, Biologiezentrum/Oberösterreichische Landesmuseen, 2012: 294-314〕
Because of a taxonomic error by one researcher in the 19th century, specimens of ''Dileptus margaritifer'' have been misidentified in most studies as ''Dileptus anser'' (Müller, 1773).〔
==Morphology==
''Dileptus margaritifer'' has a slender body, usually about 450 µm in length and very flexible, narrowing at the posterior into a small, sharp tail. At its front, it has a broad and tapering proboscis, reminiscent of an elephant's trunk in its shape and flexibility, but with a flattened rather than round cross-section. The proboscis is 1/3 to 1/2 of the total body length. The cellular mouth (cytostome) sits at the base of the proboscis within a protuberance called the "oral bulge." The cell has a row of 4-20 contractile vacuoles along the dorsal surface, and at least 200 macronuclei scattered in the cytoplasm, with several spherical micronuclei distributed among them.
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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