Image of Alaria mustelae; a. Drawing of cercaria structure b. Cercaria stained with 0.5% neutral red c. Sporocyst stained with 0.5% neutral red d.–f. Images of Scanning Electronmicroscope Abbreviations: os – oral sucker, p – pharynx, es – eye spot, ep – esophagus, vs – ventral sucker, in – intestine, pg – penetration gland, eb – excretory bladder, ta – tail, fu – furca, spo: sporocyst, c – cercaria (scale a, b = 50 µm, c = 10 µm).