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Subclass opisthobranchia
/sˈʌbklas ˌɒpɪsθəbɹˈankiə/
/sˈʌbklæs ˌɑːpɪsθəbɹˈænkiə/Subclass opisthobranchia
01
gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
