Scanning electron microscopy of cuticular surface of the adults Paragonimus heterotremus in Phitsanulok, Thailand.

Scanning electron microscope observation of surface structure was made on adult Paragonimus heterotremus (Phitsanulok, Thailand) and the surface topography of the anterior end, suckers, body cuticle and papillae was described. The numerous thorn-like tegumentary spines were distributed all over the surface. The spines were well-developed and branched. The papillae were divided into two types: dome-shaped and ciliated. Two pairs of papillae were seen around the lip of the oral sucker, while those around the ventral sucker were not evident.