Adult in man Egg Miracidium Snail (Sporocyst Redia Cercaria). Cercaria enter fish and encysts as Metacercaria in fish (mullet ( Mugil cephalus ) and minnow ( Gambusia affinis ). Metacercaria swallowed in undercooked fish, excysts in small intestine and develops into adult in 7 days.
Similar to Heterophyes. Adult in jejunum of man (but also cats, dogs, pigs, and pelican). Egg ingested by snail. Miracidium in intestine of snail. Sporocyst Mother redia Daughter redia Cercaria. Metacercaria in fish. Ingested metacercaria excysts in duodenum and develops into adult in jejunum.