Sponsored by definitive host and intermediate host .
Some parasites have two hosts in their life cycle.
The host in which a parasite reaches sexual maturity and reproduces is called the definitive host . The other host is called the intermediate host . In the case of the hydatid tapeworm, dogs are the usual definitive hosts and sheep are the usual intermediate hosts. The immature stage of an animal. The larva does not have the same structure as the adult form.