A marine mollusk of a group that includes the sea slugs and sea hares. They have a small or absent shell and are typically brightly colored with conspicuous external gills.
Subclass Opisthobranchia, class Gastropoda
Pronunciation
opisthobranch
/əˈpisTHōˌbraNGk//əˈpɪsθoʊˌbræŋk/
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