CLADOENDESIS OF EPHEMEROPTERA
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Figs 61–64. Mutelocloeon corbeti. 61 – genitals of male imago (muscles shown by interrupted lines; at left half, ventral view; at right half, dorsal view, gonostylar muscle not shown). 62 – the same, median section (external surfaces dotted); 63, 64 – subimaginal exuviae spread on slide (on the same scale): 63 – right half of mesonotum; 64 – subalar sclerite of mesothorax. Abbreviations: gd – gonoduct; gs1, gs2, gs3 – segments of gonostylus; m.IX-X – paired intersegmental muscle going from abdominal sternum IX to paraprocts; m.gs – gonostylar muscle; m.gv1, m.gv2 – muscles of gonovectis; m.s – sterno-styligeral muscle; us – unistyliger.