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Coccidia (Coccidiasina) are a subclass of microscopic, spore-forming, single-celled obligate intracellular parasites belonging to the apicomplexan class Conoidasida. As obligate intracellular parasites, they must live and reproduce within an animal cell. Coccidian parasites infect the intestinal tracts of animals,〔(【引用サイトリンク】title= Biodiversity explorer: Apicomplexa (apicomplexans, sporozoans) )〕 and are the largest group of apicomplexan protozoa. Infection with these parasites is known as coccidiosis. It is commonly found in dogs' intestines, especially in puppies due to their immature immune systems.〔(Coccidia in Dogs )〕 It is also found in cats and kittens. ==Taxonomy== The class is divided into four orders which are distinguished by the presence or absence of various asexual and sexual stages: *Order Agamococcidiorida Levine 1979 *Order Eucoccidiorida Léger & Duboscq 1910 *Order Ixorheorida Levine 1984 *Order Protococcidiorida Kheisin 1956 The order Eucoccidiorida is divided into two suborders. These two groups differ in their sexual development: syzygy for Adeleorina and independent gametes for Eimeriorina. The first suborder, Adeleorina, comprises coccidia of invertebrates and the coccidia that alternate between blood-sucking invertebrates and various vertebrates; this group includes ''Haemogregarina'' and ''Hepatozoon''. There are seven families in this suborder. The second suborder, Eimeriorina, comprises coccidia of a variety of coccidia many of form cysts. A number of genera, including ''Toxoplasma'' and ''Sarcocystis'', infect vertebrates. 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「coccidia」の詳細全文を読む スポンサード リンク
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