CLADOENDESIS OF EPHEMEROPTERA
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Fig. 694–699. Hubbardula heterolepida. 694 – posterior margin of abdominal sternum IX of female subimago; 695 – the same of female larva; 696 – protogonostyli and protopenis of last instar male larva (dorsal view); 697 – penis of male imago, ventral view; 698–699 – genitalia of male imago, ventral view. Abbreviations: gs1, gs2+3, gs4 – 1st–4th segments of gonostylus; m.gs – muscle of gonostylus; m.p – muscle of penis; m.s – sterno-styligeral muscle; sg – styliger.