Orthonectida
When they are ready to reproduce, the adults are released from the host, and sperm from the males penetrates the bodies of the females to achieve fertilisation. The resulting zygote develops into a ciliated larva that escapes from the mother to seek out new hosts. Once it finds a host, the larva loses its cilia and develops into a syncytial plasmodium larva. This, in turn, breaks up into numerous individual cells that become the next generation of adults.