Fig. 2. The embryonated small-sized eggs with an operculum (Group I). A. Clonorchis sinensis; B. SEM-view of C. sinensis egg; C. Metagonimus yokogawai; D. Heterophyes nocens; E. Pygidiopsis summa; F. Stictodora fuscata; G. Plagiorchis muris; H. Eurytrema pancreaticum; I. Gymnophalloides seoi. Scale bar = 10 ㎛.