CLADOENDESIS OF EPHEMEROPTERA
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Fig. 59–65. Procloeon (Securiops) falcatum. 59–60 – parts of male subimago extracted from larva: 59 – abdomen; 60 – genitalia; 61–64 – young male subimago: 61 – abdomen; 62 – genitalia; 63 – fore femur; 64 – hind wing (partly crumpled); 65 – genitalia of male imago (after Crass 1947). Abbreviations: gs1, gs2, gs3 – 1st–3rd segments of gonostylus; pb – median projection of penial bridge; usg – unistyliger.