CLADOENDESIS OF EPHEMEROPTERA
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Kluge 2013 Nonnullidens: Figs 1-3 4-10 11-16 17-22 23-28 29-31 32-38 39-40 41-44 45-48 49-50 51-53

Figs 17–22. Nonnullidens variegatus. 17, 20 – apex of penis of male imago, ventral view; 18, 21 – genitals of male imago, ventral view; 19 – exuviae of subimaginal gonostylus; 22 – posterior margin of sternum IX of male larva of last instar and larval protopenis (19–22, holotype).