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

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Pachypsylla cohabitans benefits by being hidden and protected by the gall-forming psyllids without harming them, while the gall-forming psyllids are not affected (neither positively nor negatively). This is an example of commensalism.

Pachypsylla Cohabitans, a Psyllid (Jumping Plant Lice), Feeds Next to Other