cystacanth造句

• The cystacanth stage is long lived and probably remains infective throughout the life of the crab.
• It then penetrates the gut wall, moves into the body cavity, encysts, and begins transformation into the infective cystacanth stage.
• This can be by a suitable final host, in which case the cystacanth develops into a mature adult, or by a paratenic host, in which the parasite again forms a cyst.