The Hemioniscidae are a family of marine isopod crustaceans in the suborder Cymothoida. The original description was made by Bonnier in 1900.Bonnier, J. (1900). Contribution a l'étude des épicarides. Les Bopyridae. Travaux de la Station Zoologique de Wimereux 8: 1-475, pls. 1-41. Members of this family are parasitic on cirripede barnacles.
The family contains these genera and species:World Register of Marine Species Hemioniscus Buchholz, 1866 Hemioniscus balani Buchholtz, 1866 Hemioniscus pagurophilus Williams & Boyko, 2006 Leponiscus Giard, 1887 Leponiscus alepadis Gruvel, 1901 Leponiscus anatifae Giard, 1887 Leponiscus pollicipedis Giard, 1887 Scalpelloniscus Grygier, 1981 Scalpelloniscus binoculis (Menzies & George, 1972) Scalpelloniscus nieli Hosie, 2008 Scalpelloniscus penicillatus Grygier, 1981 Scalpelloniscus vomicus Hosie, 2008
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