Scanning electron microscopy of newly excysted metacercariae of Paragonimus westermani-like, Nakhon Nayok, Thailand.

: Scanning electron microscope (SEM) observation of surface structure was done on newly excysted metacercariae of Paragonimus westermani-like (Nakhon Nayok, Thailand). The surface of the body was covered with numerous single-pointed tegumentary spines, large dome-shaped papillae, small one with a pit, and small one with a smooth surface were situated around the suckers. There were 27 to 30 of the small dome-shaped papillae with a pit around the oral sucker and 10 to 13 of the small ones with a smooth surface around the ventral sucker. The present report is the new record of excysted metacercariae of P. westermani-like (Nakhon Nayok, Thailand) by SEM.