SEM of specimens of Neoechinorhynchus personatus from Mugil cephalus in the Mediterranean Sea off Tunisia. 17. The separation line (arrows) between the pebbled neck surface (left) and the anterior trunk with micropores of a specimen. 18. A sensory pore in the neck of a specimen showing the pebbled surface of the neck and the non-pebbled depression around the pore. 19. A magnified view of the neck surface depressions. 20. Micropores (arrow) in the anterior trunk of a specimen. 21. The bursa of a male specimen showing no visible ornamentation or pores. 22. Eggs.