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[Metagonimus yokogawai]

Metagonimus yokogawai adult flukes are minute intestinal flukes (1-2.5 mm in length) that resemble Heterophyes heterophyes.  An important distinctive feature is the position of the ventral sucker (genitoacetabulum), which is to the side of the midline and closely associated with the genital pore.  Adults reside in the small intestine of the definitive host.

A

A: Adult M. yokogawai, stained with carmine.  In this figure, the following structures are labeled:  oral sucker (OS), pharynx (PH), intestine (IN), genitoacetabulum (GA), ovary (OV), the large, paired testes (TE), and eggs within the uterus (EG).