MOLLUSCA: Diversity I
- Prosobranchia (marine snails; large shell, anterior mantle cavity, 1 or 2 ctenidia- some unipectinate, operculum, separate sexes)
- Opisthobranchia (sea slugs; shell & mantle cavity reduced or absent, ctenidia & operculum absent in most, hermaphroditic)
- Pulmonata (land snails/slugs; shell present/absent, mantle cavity is a lung, ctenidia & operculum absent in all, hermaphroditic)
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Copyright © 1999 by A. Richard Palmer. All rights reserved.
(revised Jan. 14, 1999)