| Hemioniscus balani | |
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| Species: | H. balani
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| Binomial name | |
| Hemioniscus balani Buchholtz, 1866[1]
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Hemioniscus balani, a species of isopod crustacean, is a widespread parasitic castrator of barnacles in the northern Atlantic Ocean. Its range extends from Norway to the Atlantic coast of France, and as far west as Massachusetts.[2] It is also commonly found on the Pacific coast of North America; it is not known if the Pacific and Atlantic populations are the same species, or if the Pacific population exists following human-assisted introduction.