Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
An extensive division of gastropod Mollusca in which the loopor visceral nerves is twisted, and the sexes separate. It is nearlyto equivalent to Prosobranchiata.
Share your knowledge with the community
Browse our collection of 300,000+ community-written definitions
