CLADOENDESIS OF EPHEMEROPTERA
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Fig. 172–181. Petersula heptagenoides. 172 – apex of left penis lobe of male imago, median view; 173 – the same, ventral view; 174 – posterior margin of abdominal sternum IX of female larva; 175–177 – protogonostyli and protopenes of male larvae of antepenultimate, penultimate and last instars; 178 – posterior margin of abdominal sternum IX of female subimago; 179–180 – penis of male imago with focus on ventral and dorsal side (gonoduct shown by dotted lines); 181 – left penis and gonostylus, median view cutting line shown with dotted line). Abbreviations: gp – gonopore; pgs – protogonostylus; pp – protopenis.