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Demidospermus tocantinensis n. sp. from Auchenipterus nuchalis. (A) Total, ventral view; (B) Hook; (C) Copulatory complex, knee-like expansion of the male copulatory organ (arrow), ventral view; (D) Ventral bar; (E) Dorsal bar; (F) Ventral anchor; (G) Dorsal anchor. Scale bars: (A) 100 μm; (B) 10 μm; (C) 30 μm; (D–G) 20 μm.
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