SEM of specimens of Rhadinorhynchus laterospinosus from Auxis rochei and Auxis thazard in the Pacific Ocean off Vietnam. (10) The proboscis of a female specimen. (11) The apical end of the proboscis in Figure 10 showing the smaller apical hooks, the organization of hook rows and no external evidence of an apical organ. (12) A typical example of hook shape and orientation from the midsection of a proboscis. (13) A magnified view of a hook showing its surface serrations. (14) A broken hook demonstrating its thick core and thin cortical layer. (15) Posterior end of a proboscis showing the larger hooks in the posterior circle and a sensory pit.