Section of Radix labiata hepatopancreas with Fascioloides magna rediae and immature (A), mature (B) cercariae. Stained with hematoxylin and eosin. HP, hepatopancreas tissue; C, cercaria; R, redia; T, tegument of redia; A, acetabulum; OS, oral sucker; TC, tail of cercaria; CGP, cystogenous gland products. White arrowheads point to cercarialcystogenous glands. Black arrowheads point to cercarial cystogenous products released from the glands.