sporocyst
/ˈspɔːrəsɪst/noun
1- Zoology a parasitic fluke in the initial stage of infection in a snail host, developed from a miracidium【动】包蚴。
1.1
- (in parasitic sporozoans) an encysted zygote in an invertebrate host（寄生孢子虫）孢子囊。