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(in gastropod molluscs) the evolutionary reversion of a group to a primitive linear body plan.
- ‘The latter group includes radically modified animals, the Opisthobranchia and Pulmonata, which undergo detorsion and essentially re-evolve bilateral symmetry.’
- ‘Some species undergo reverse torsion (‘detorsion’), but evidence of having passed through a twisted phase can be seen in the anatomy of these forms.’
- ‘The bodies of most members of this group show evidence of detorsion.’
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