Century Dictionary and Cyclopedia
- Same as Opisthobranchiata.
GNU Webster's 1913
- n. (Zoöl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.
- n. gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs; sea butterflies; sea hares
“The mollusk taxon that is best represented on the Internet is probably the Opisthobranchia, the sea slugs.”
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