Pachypsylla cohabitans, a psyllid (jumping plant lice), feeds next to other gall-forming psyllids in order to be enveloped in the gall.

Pachypsylla cohabitans, a psyllid (jumping plant lice), feeds next to other gall-forming psyllids in order to be enveloped in the gall. This doesn’t harm the gall-forming insect. This relationship is an example of