5a Marginal spines or tubercles on rostrum present (fig A); terminal elements of gonopod long and slender, straight or curving gently (fig B) --> go to couplet 6.
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5b Marginal spines or tubercles on rostrum absent (fig A); terminal elements of gonopod strongly curved caudally (towards the tail), claw-shaped, usually to 90o (fig B) --> go to couplet 12.
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