The xillian race was often thought to be unique as their similarity and traits to the now extinct homosapiens were extremely similar,These group also belonged to a extinct species of earth , Namely the (insecta).
These species were thought to be only the drone , or perhaps a sub species of the entire hive.

Biological trait
Being covered by a exoskeleton , it is possible these species goes through extensive shedding or metamorphisis ,though not much is known about the wing, it is certainly immobile.

The xillians act in a very sentient manner , not much is known on why they capped their intellegence to such minimal level, It is believed that a celebrate host exist within the hive colony and researchers are risking their life into the depth of the chambre for idealistic samples.