Two species of Pleorchis Railliet, 1896 are described from Tonkin gulf, Vietnam. Pleorchis sciaenae Yamaguti. 1938 from the intestine of Acanthopagus berda. has 44 testes
in the anterior limit of its vitelline fields, which never reach the pharynx, and a much longer hindbody in relation to the size of the fore body va P. hainanensis Shen, 1983 from the intestine of Nibea albinora, has 44 testes. This species can be distinguished from P. sciaenae by a relatively much longer hindbody, a long prepharynx and oesophagus, and an intestinal bifurcation well anterior to the ventral sucker.