CLADOENDESIS OF EPHEMEROPTERA
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Figs 23–28. Nonnullidens depapricus, male larva (holotype). 23–26 – tergalii of I, IV, V and VII pairs; 27 – hind protopteron (developing subimaginal wing shown by interrupted line); 28 – protopenis (developing subimaginal penis shown by interrupted line).