CLADOENDESIS OF EPHEMEROPTERA
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Fig. 25–30. Procloeon (Securiops) falcatum. 25–28 – larval exuviae (with same magnification): 25 – abdominal sterna; 26 – abdominal terga; 27 – half of pronotum and mesonotum; 28 – fore leg; 29 – exuviae of metanotum with hind protoptera, left metapleuron and 1st abdominal tergum, enlarged; 30 – fore protopteron, to show correspondence between cuticular coloration and veins visible inside.