Researchers in Mississippi have discovered a previously unknown species of parasitoid wasp that matures inside the bodies of living, adult fruit flies before bursting out of them like a xenomorph in the "Alien" movies.

The sneaky predator, which researchers have named Syntretus perlmani, is the first wasp found to infect adult fruit flies — similar wasp species are known to target flies during their younger, more vulnerable larva and pupa life stages. The wasps are parasitoids rather than parasites because they always kill their hosts, while parasites usually don't.

A team of scientists came across the wasp by chance while collecting a common fruit fly called Drosophila affinis in their backyards in Mississippi. They published their findings Wednesday (Sep. 11) in the journal Nature.