单词	detorsion
释义	detorsion /dɪˈtɔːʃ(ə)n / noun [mass noun] Zoology (In gastropod molluscs) the evolutionary reversion of a group to a primitive linear body plan. Compare with torsion.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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