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SEM of specimens of Neoechinorhynchus johnii from Eleutheronema tetradactylus, Johnius carouna, and Otolithes ruber in the Pacific Ocean off Vietnam. (7) Micropores at the posterior trunk of the same male specimen in Figure 6. Note the different pore diameter and distribution indicative of differential nutrient absorption of different parts of the trunk. (8) The posterior end of a male specimen showing the site of the invaginated bursa. (9) The plain evaginated bursa tilting ventral at the posterior end of a male specimen. (10) Normal rounded outline of the posterior end of a female specimen. (11) A constriction occasionally seen at the posterior end of female specimens contains the looped posterior end of the reproductive system. (12) An egg of the lantern-like variety with fibrous elements.
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