SEM of specimens of Pararhadinorhynchus magnus n. sp. from Scatophagus argus in Vietnam. (15) An evaginated proboscis showing the gradual decline in hook length posteriorly. Note the sharp posterior curvature of the ventral hooks and the less posteriorly curved dorsal hooks. (16) A proboscis deeply embedded in host intestinal wall showing a remaining part of the mucosal layer. (17) Proboscis hooks near the midsection of the proboscis. (18) A more sharply curved basal proboscis hook. (19) The transition between the proboscis showing no micropores (right) and the neck (left) with clear micropores. (20) Prominent widely spaced micropores on the mid-trunk; compare with neck micropores in Figure 19. (21) The posterior end of a male specimen showing the deep cleft marking the invaginated bursa.