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Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Systellommatophora
Superfamily: Onchidioidea
Family: Onchidiidae
Genus: Onchidium
Buchannan, 1800[1]

Onchidium is a genus of air-breathing sea slugs, shell-less marine pulmonate gastropod mollusks in the family Onchidiidae. There are only three species currently recognised in the genus.[2]


According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus Onchidium :[3]

Synonymized species 


  • SEM images of the radula can be found at Thompson; Bebbington (1973). "Scanning electron microscope studies of gastropod radulae". Malacologia. 14: 147–165. 
  1. ^ Buchannan, F. 1800: An account of the Onchidium, a new genus of the class of Vermes, found in Bengal. Transactions of the Linnean Society, 5: 132-134, tab. V. BHL
  2. ^ Dayrat, B. et al. 2016: Integrative taxonomy of the genus Onchidium Buchannan, 1800 (Mollusca, Gastropoda, Pulmonata, Onchidiidae). ZooKeys, 636: 1-40. doi:10.3897/zookeys.636.8879
  3. ^ WoRMS: Onchidium; accessed : 13 January 2011
  4. ^ Dayrat, B. (2010). Onchidium celticum Cuvier in Audouin & Milne-Edwards, 1832. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=446185 on 2010-05-18
  • Dayrat, B. (2009) Review of the current knowledge of the systematics of Onchidiidae (Mollusca: Gastropoda: Pulmonata) with a checklist of nominal species. Zootaxa 2068: 1-26