Image of Cardicola alseae; a. Drawing of cercaria structure b. Cercaria stained with Semichon’s acetic carmine & fast green c. Sporocyst stained with 0.5% neutral red d.–f. Images of Scanning Electronmicroscope Abbreviations: dm – dorso-median finfold, pg – penetration gland, eb – excretory bladder, an – anterior organ, ta – tail, cb – caudal body, sp – spine, fu – furca, spo: sporocyst, c – cercaria (scale a, b = 50 µm, c = 20 µm).