An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

OPISTHOBRANCH   Marine Mollusks which are characterised by having a single gill behind and to the right of the heart; they also have a reduced or absent shell and always lack an OPERCULUM. Included in this group are the BUBBLE SHELLS, the NUDIBRANCHS, SEA HARES and SEA BUTTERFLIES.

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