The parasitic larval stage of the tapeworm Taenia multiceps that consists of a cyst in which the scolex develops and that infects the central nervous system of ruminants,especially sheep.

• 共尾幼虫绦虫多节绦虫的寄生虫幼虫阶段，有囊胞，头节在其中生长，使反刍动物尤其是羊的中枢神经系统感染