pieces of a Boolite, including the mouth
Boolites are an alien species whose body parts can survive independently for up to six months when separated. If their body parts are re-aligned correctly, they can heal themselves. Boolites can even articulate thoughts with half their brains missing, although information from specific neural tissues is lost until that tissue is recovered.
An unnamed Boolite appears in the Farscape episode "Fractures," albeit in numerous pieces.
Boolites also have high concentrations of metal in their body, and weapons designed to destroy the bonding of metallic molecules (such as the one seen in "Fractures") are particularly effective against them.