inquiline

The other study[…]involved the larvae of the caterpillar Maculinea rebeli, an inquiline of Myrmica schenki.

Captured prey also constitute the resource base for a community of inquiline bacteria, protozoa, and invertebrates that inhabit the water-filled pitchers. For at least two of these inquilines (the pitcher-plant mosquito Wyeomyia smithii Coquillet and the pitcher-plant midge Metriocnemus knabi Coquillet) the availability of captured prey limits individual growth, and ultimately population growth[…]