 opisthobranchia |
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| 1. | [ noun ] (biology,zoology) gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares | |
| Synonyms: | subclass_Opisthobranchia | |
| Related terms: | class Gastropoda Nudibranchia | |
| Similar spelling: |
Opisthognathidae Opisthocomus Opisthocomidae |
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