CLADOENDESIS OF EPHEMEROPTERA
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Figs 23–29. Procloeon monilistylus. 23 – posterior margin of male larval abdominal sternum IX and subimaginal genitals developing under larval cuticle (right gonostylar muscle shown by interrupted lines); 24 – genitals of male subimago, ventral view (imaginal gonostyli and gonostyli pedestals developing under subimaginal cuticle, shown by interrupted lines); 25 – male imaginal abdominal sternum IX with styliger and gonostyli (unpaired sterno-styligeral muscle, pair of penial muscles and right gonostylar muscle shown by interrupted lines); 26 – had and thorax of female imago, frontal view; 27 – head of female imago, dorsal view; 28 – head of male imago, dorsal view; 29 – head of male imago, lateral view.