Anterior part of Placobdelloides siamensis. (A) Scanning electron microscope (SEM) showing oral sucker, numerous pits inside and mouth at terminal lip, (B) Dorsal surface showing eye placement at somite III. The dorsal color is uniformly brownish-gray, with randomly distributed dark brown, yellow, and green spots. The dorsal median line is yellowish, between four pairs of scarlet ovals. On the margin, brown, yellow, and green spots are present along the caudal sucker. The ventral surface is transparent.