what becomes of "kleptotypes" if the holotype is destroyed?

[Mary Barkworth]

Personally I hate to think of a fragment becoming more that a kleptotype
but I suppose it may indeed be the holotype.  If an insect ate all but a
small fragment of a holotype the bit of specimen that remains would
still presumably be considered the holotype. The most desirable
situation would be for it to be possible to locate a more adequate
specimen, possibly a duplicate of the holotype, in another institution.
The Code, as I recall has recommendations for selecting neotypes. Would
designation of a neotype in the circumstances Thomas outlines be
permitted under the Code? 

For me it is a hypothetical question, at least for now.