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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.
- Ragan MA, Goggin CL, Cawthorn RJ, et al. (October 1996). "A novel clade of protistan parasites near the animal-fungal divergence". Proc. Natl. Acad. Sci. U.S.A. 93 (21): 11907–12. doi:10.1073/pnas.93.21.11907. PMC 38157. PMID 8876236.
- Müller J. 1841: Über Psorospermien. Arch. Anat. Physiol. Wissensch. Med. 5: 477–496
- Revere Randolph Gurley (1894). The Myxosporidia, or Psorosperms of fishes: and the epidemics produced by them. Govt. print. off. p. 72. Retrieved 10 April 2010.
- "Arch Derm Syphilol -- Excerpt: KERATOSIS FOLLICULARIS (DARIER'S DISEASE) A VITAMIN A DEFICIENCY DISEASE, February 1941, PECK et al. 43 (2): 223".
- 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.
- "2009 ICD-9-CM Diagnosis Code 136.4 : Psorospermiasis".
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