Morphology. The adult worm is dorso-ventrally flat, tapering anteriorly, globular and bluntly ending posteriorly, and 0.5-0.8 by 0.3-0.4 mm in size. Neighboring the ventral sucker, genital apparatus present left anterolaterally, 0.06-0.10 by 0.03-0.05 mm in size. Genital apparatus are crescent shape and present two groups of small spine like gonotyls. Intrauterine egg is yellowish brown color, ovoid, operculated, thick shelled, very similar to those of C. sinensis, and 20-23 by 11-13 mm in size.