CLADOENDESIS OF EPHEMEROPTERA
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Fig. 182–187. Petersula spp. 182–186 – Petersula heptagenoides: 182–184 – genitalia of male imago; 185 – subimaginal exuviae of male genitalia; 186 – subimaginal exuviae of wing; 187 – the same of P. courtallensis. Abbreviations: gd – gonoduct; gs1–gs4 – 1st–4th segments of gonostylus; sg – styliger.