Cestoda life stage metacestode metacestode stage The larval stages of a tapeworm, beginning with the metamorphosis of the oncosphere and ending with the first evidence of sexuality in the adult worm. Includes the procercoid and plerocercoid stages of pseudophyllid cestodes, and the cysticercus, cysticercoid, coenurus, and hydatid stages of cyclophyllidean cestodes. jl16 WBls:0000716 2016-03-17T15:02:35Z worm_development