CLADOENDESIS OF EPHEMEROPTERA
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Fig. 130–144. Petersula heptagenoides, larvae. 130–136 – tergalii I–VII (costal margin facing up, ventral lamella turned at left, dorsal lamella at right; holotype); 137–138 and 140–141, fore- and hind protoptera; 139 and 142, hind protoptera enlarged; 144, posterior margin of abdominal tergum IX (black triangle shows median line).