(in gastropod molluscs) the evolutionary reversion of a group to a primitive linear body plan.
〔动〕（腹足纲软体动物的）反扭转。比较TORISON
Compare with torsion
Example sentencesExamples
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.
Definition of detorsion in US English:
detorsion
noundēˈtôrSHən
Zoology
(in gastropod mollusks) the evolutionary reversion of a group to a primitive linear body plan.
〔动〕（腹足纲软体动物的）反扭转。比较TORISON
Compare with torsion
Example sentencesExamples
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 latter group includes radically modified animals, the Opisthobranchia and Pulmonata, which undergo detorsion and essentially re-evolve bilateral symmetry.
The bodies of most members of this group show evidence of detorsion.