CLADOENDESIS OF EPHEMEROPTERA
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Figs 52–54. Procloeon (Monilistylus) monilistylus: 52–53 – genitalia of male imago (corrected from Kluge et al. 2014); 54 – exuviae of subimaginal gonostyli. Abbreviations: gs1, gs2, gs3 – segments of gonostylus; m.gs – gonostylar muscle; m.gv – gonovectal (penial) muscle; m.s – median and lateral portions of styligeral muscle; usg – unistyliger.