CLADOENDESIS OF EPHEMEROPTERA
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Fig. 137–142. Procloeon (Securiops) primasia. 137–141 – genitalia of male imagines: 137 – ventral view; 138 – lateral view, right gonostylus and styliger removed; 139 – lateral view of penis; 140 – apex of penis with focus on its dorsal margin; 141 – the same penis with focus on ventral side; 142 – subimaginal exuviae of genitalia.