part_of part of Cestoda life stage hydatid cyst stage jl16 WBls:0000714 Note that a hydatid cyst is a type of bladder larva, a larval form in which one or more scoleces develop in a fluid-filled cyst. Other types of bladder larva include cysticercus, coenurus and strobilocercus. 2016-03-17T14:27:42Z A larval stage of cestodes characterized by internal (and often external) chambers lined by germinal epithelium. The inner germinal layer of hydatid cysts is cellular and the protoscolex develops from those cells. metacestode vesicle worm_development hydatid cyst metacestode