Haploporus mugilis sp. n. (Digenea: Haploporidae) was obtained from the intestine of kandas, Valamugil engeli (Bleeker) (Mugilidae, Perciformes) in the Taiwan Straits, China. It most closely resembles Haploporus spinosus Machida, 1996 from the intestine of Crenimugil crenilabis in Japanese and adjacent waters in the intestinal bifurcation posterior to the acetabulum, in egg-size (0.039-0.044 × 0.019-0.022 in H. mugilis and 0.034-0.042 × 0.018-0.023 in H. spinosus) and in the hermaphroditic sac armed with spines. However, it differs from the latter in its hermaphroditic sac with two long and numerous small spines rather than with four long and six small spines and in the excretory vesicle with a single prominent refractory concretion instead of being empty.
Lasiotocus lizae sp. n. (Digenea: Monorchiidae) was collected from the intestine of Liza carinata (Valenciennes) (Mugilidae, Perciformes) in the Taiwan Straits, China. L. lizae is most similar to Lasiotocus glebulentus Overstreet, 1971 from the intestine of Mugil cephalus from the Northern Gulf of Mexico in having tightly compacted vitellaria, a genital pore sinistral to the midline, the ovary usually dextral to the acetabulum, the similar sucker ratio, and in the presence of both a canalicular and uterine seminal receptacle. It differs from L. glebulentus in its cirrus sac ending anterior to rather than posterior to acetabulum, in the ending position of caeca, in smaller eggs, and in having a single rather than several conspicuous concretions in excretory vesicle.