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A comparison between specimens of Neoechinorhynchus personatus from Mugil cephalus in the Mediterranean Sea off Tunisia and from the Black Sea (Figs. 1, 3, 5–7, 9) and specimens of Neoechinorhynchus ponticus n. sp. from Chelon auratus from the Black Sea (Figs. 2, 4, 8, 10). 1. Adult male specimen of N. personatus from M. cephalus in Tunisia. Note the extension of the unequal lemnisci to the anterior testis and the number of the giant nuclei in the cement gland. 2. A smaller male specimens of N. ponticus from C. auratus, in the Black Sea, drawn to same scale. Note the shorter lemnisci and smaller reproductive system. 3. A female specimen of N. personatus with long unequal lemnisci, near terminal gonopore, and 6 dorsal and 2 ventral giant subcutaneous nuclei. 4. A smaller adult female specimen of N. ponticus n. sp. from C. auratus in the Black Sea, drawn to same scale as Fig. 3. Note small lemnisci. Eggs and ovarian balls not shown. 5. A ripe egg from a gravid female specimen of N. personatus from M. cephalus. 6. A female reproductive system of a specimen of N. personatus from M. cephalus which is comparable to that of N. ponticus from C. auratus. Note the prominent ligament strand connecting anterior end of uterus at uterine glands with posterior body wall near the vagina dorsally. 7. Proboscis of a male specimen of N. personatus from M. cephalus in Tunisia. Note the 2 giant nuclei in the prominent apical organ (arrow), and the anterior trunk ring. 8. The smaller proboscis of a male specimen of N. ponticus n. sp. from C. auratus, in the Black Sea drawn to same scale as Figure 7. An arrow points to the giant nuclei of the apical organ. 9. A high magnification of one row of hooks from the proboscis of a male specimen of N. personatus from M. cephalus.10. A high magnification of one row of the smaller hooks from the proboscis of a male specimen of N. ponticus from C. auratus. drawn to same scale as the hooks in Fig. 9.

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