CLADOENDESIS OF EPHEMEROPTERA
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Fig. 116–119. Procloeon (Securiops) primasia, exuviae of labium. 116 – labium (ventral setae of glossae directed proximally); 117 – 2nd and 3rd segments of labial palp; 118–119 – glossae in ventral and dorsal views (ventral setae directed proximally). Abbreviations: pm1, pm2, pm3 – 1st–3rd palpomeres; s.d – dorsal setae of glossae; s.v – ventral setae of glossa.