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Psorosperm (from the Greek ψωρα itch and σπερμα seed) is a name formerly given to a number of parasitic protozoa which produce cystlike or sporelike structures in the tissue of hosts, but now essentially obsolete. * Some which affect vertebrate hosts are now identified as coccidia. * Others, such as the cause of pébrine in silkworms, are now recognized as microsporidians, and some are regarded as myxosporidians. * The genus ''Psorospermium'' (which includes the species ''Psorospermium haeckeli'') itself is a parasite of crayfishes, and belongs to an enigmatic group of unicellular organisms which some biologists think may be related to the common ancestors of animals and fungi. The term was introduced in German (as ''Psorospermien'') by J. Müller in 1841.〔Müller J. 1841: Über Psorospermien. Arch. Anat. Physiol. Wissensch. Med. 5: 477–496〕 Psorosperm was at one point believed to be the cause of Darier's disease.〔F. J. Darier. De la psorospermose folliculaire végétante. Étude anatomo-pathologique d'une affection cutanée non décrite ou comprise dans le groupe des acnés sebacées, cornées, hypertrophiantes, des kératoses (ichtyoses) folliculaires, etc. Annales de dermatologie et de syphilographie, Paris, 1889, 10: 597-612.〕 "Psorospermiasis" is classified under 136.4 in ICD-9.〔(【引用サイトリンク】title=2009 ICD-9-CM Diagnosis Code 136.4 : Psorospermiasis )〕 == References == 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「Psorosperm」の詳細全文を読む スポンサード リンク
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