CLADOENDESIS OF EPHEMEROPTERA
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Figs 474–478. Thraulodes nigrabdominalis. 474 – genitalia of male imago in ventral view; 475 – their subimaginal exuviae; 476 – hind wing; 477–478 – protogonostyli and protopenis of presumably associated larva, with subimaginal gonostyli and styliger at early stage of development shown by interrupted line (474–476 – holotype).