Image of Apatemon gracilis; a. Drawing of cercaria structure b. Cercaria stained with 0.5% neutral red c. Sporocyst stained with 0.5% neutral red d.–g. Images of Scanning Electronmicroscope Abbreviations: os – oral sucker, p – pharynx, es – eye spot, vs – ventral sucker, in – intestine, pg – penetration gland, eb – excretory bladder, ta – tail, cb – caudal body, fu – furca, b – body, sp – spine, spo – sporocyst, c – cercaria (scale a, b = 100 µm, c = 20 µm).