|(unranked)||Choanozoa or Holozoa|
Arkush et al., 2003
Sphaerothecum destruens (the rosette agent) is a parasite of fish. It was first discovered in the United States in association with invasive species including topmouth gudgeon but was found to be the causative agent of a disease in the UK affecting salmonid species such as Atlantic salmon and brown trout. It is thought to pose more of a risk in Europe than in the USA as native species there are more susceptible to the parasite. The disease causes high rates of morbidity and mortality in a number of different salmonid species and can also infect other UK freshwater fish such as bream, carp and roach. The genus Sphaerothecum is closely related to the genera Dermocystidium and Rhinosporidium.
- M. A. Ragan, C. L. Goggin, R. J. Cawthorn, L. Cerenius, A. V. Jamieson, S. M. Plourde, T. G. Rand, K. Söderhäll & R. R. Gutell (October 1996). "A novel clade of protistan parasites near the animal-fungal divergence". Proceedings of the National Academy of Sciences. 93 (21): 11907–11912. doi:10.1073/pnas.93.21.11907. PMC . PMID 8876236.
- Kristen D. Arkush, Leonel Mendoza, Mark A. Adkison & Ronald P. Hedrick (2003). "Observations on the life stages of Sphaerothecum destruens n. g., n. sp., a mesomycetozoean fish pathogen formerly referred to as the rosette agent". Journal of Eukaryotic Microbiology. 50 (6): 430–438. doi:10.1111/j.1550-7408.2003.tb00269.x. PMID 14733435.
- "Deadly parasite could endanger salmon and trout populations in U.K.". Science Daily. June 20, 2009.
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