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''Plasmodium vaughani'' is a parasite of the genus ''Plasmodium'' subgenus ''Novyella''. Like all ''Plasmodium'' species ''P. vaughani'' has both vertebrate and insect hosts. The vertebrate hosts for this parasite are birds. == Description == The parasite was first described by Novy & MacNeal in 1904. The length of the asexual cycle is 24 hours. Trophozoites: Ring forms are unusual. The trophozoite is usually irregular in outline. The nucleus is small and there may be a single clear outgrowth of the cytoplasm. One ot two small pigment granules may be seen. These forms are found in mature and polychromatic erythrocytes. Schizonts: These are usually found in a polar or sub polar position within the host cell but may be found anywhere within the cell. They are found in mature or polychromatic erthrocytes. Mature forms measure 2.3 to 5.4 micrometres in width and 1.5 to 4.4 micrometres in length. They are irregular in shape but tend to be round or ovoid. Within each schizont are 4-8 merozoites. These are usually arranged in a fan like fashion but may occur at random. A transparent globule may be present along with one to three pigment granules. The host nucleus is not normally displaced. Gametocytes: The macro- and microgametocytes are very similar except for size in this species. They are elongated, possess 2-24 (usually 10) pigment granules which may be found in clumps and are usually found in mature erythrocytes. The nucleus is pale, compact and central in position. The gametocyte usually lies along the host cell nucleus but young gametoctyes may adhere to the host cell membrane. The host nucleus is not normally displaced. They are 8.0 to 13.7 micrometres in length and 1.2 to 2.8 micrometres in width. Asexual replication appears to occur in three ways: (1) by repeated binary fission of the chromatin with eventual splitting of the cytoplasm (2) by the splitting of an elongate parasite into merozoites having a bead-like arrangement (3) by the similar breaking-up of a ring-shaped form with a resulting ring of merozoites 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plasmodium vaughani」の詳細全文を読む スポンサード リンク
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