Detorsion is brought about by reversal of the above phases.
2.
Detorsion of gastropods results in an internal shell, and can be triggered by relatively minor developmental modifications such as those induced by exposure to high platinum concentrations.
3.
In some groups of gastropods ( Opisthobranchia ) there is a degree of secondary detorsion or rotation towards the original position; this may be only partial detorsion or full detorsion.
4.
In some groups of gastropods ( Opisthobranchia ) there is a degree of secondary detorsion or rotation towards the original position; this may be only partial detorsion or full detorsion.
5.
In some groups of gastropods ( Opisthobranchia ) there is a degree of secondary detorsion or rotation towards the original position; this may be only partial detorsion or full detorsion.
6.
Opisthobranchs have undergone detorsion, an evolutionary reversal of the half revolution euthyneurous ( as opposed to streptoneurous, the more common condition among gastropods, in which these ganglia form a distinct twist within the animal's body ).
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