A tiny insect known as the Ichidiku Bachi. The queen lays her egges in a hollow cavity inside Ichidiku plant. The hatched larvae grow and mate inside of the plant. When they're finished, the males die while the pregnant females depart from the Ichidiku into the outside world to lay their own eggs.
The praying mantis femal, who eats the male after they copulate.
from Petshop of Horrors