One of the mysteries of the English language finally explained.
A group of mollusks which includes the sea slugs and sea hares. They have a small or absent shell and are typically brightly colored with conspicuous external gills.
- ‘In fact, as with the Opisthobranchia, shell reduction has occurred independently a number of times in different lineages.’
- ‘In the traditional classification system, the class Gastropoda has been divided into three subclasses, Prosobranchia, Pulmonata, and Opisthobranchia.’
- ‘The latter group includes radically modified animals, the Opisthobranchia and Pulmonata, which undergo detorsion and essentially re-evolve bilateral symmetry.’
- ‘However, as with Tritonia, many other members of the subclass Opisthobranchia also exhibit swimming behavior.’
- ‘The differences in protoconch shape may prove insufficient to differentiate Allogastropoda and shell-bearing Opisthobranchia.’
Modern Latin (plural), from opistho- ‘to the rear’ + brankhia ‘gills’.
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