Ischnopsyllidae (Sometimes called a bat flea) is a family of fleas belonging to the order Siphonaptera. They have primarily parasitized bats, and have evolved to live in the fur of various bat species.

An Ischnopsyllidae's body is generally less 5mm, which is laterally compressed to easier move through bat fur.

Eggs are typically laid in a bats roost. The larva then eats organic matter in the roost before developing a cocoon near the roost. After it emerges as an adult, it finds a host to attach to.

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