Klikiss

The Klikiss were an insect-like race made up of sub breeds (worker, scientist, warrior ect.) like ants. They have a queen called a Breedex. A Breedex is a hive mind connected telepathically to its workers and warriors. The Klikiss method of breeding (if you can really call it that) is getting large Domates to eat massive amounts of genetic material and then to allow themselves to be eaten, along with the Breedex, by grubs produced by that Breedex.

The Klikiss were thought to be extinct until the very end of the 6th book where they reappear on most of their abandoned colony worlds, which had just been recolonized by humans.