CLADOENDESIS OF EPHEMEROPTERA
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Fig. 267–272. Centroptella (Crassolus) inzingae (lectotype, photos by H. Barber-James). 267 – larval abdominal segments IX–X with focus on terga; 268 – the same with focus on protogonostyli and paraprocts; 269 – part of larval exuviae with pronotum and subimaginal leg; 270 – claw (arrows show denticles); 271 – labrum; 272 – genitalia. Abbreviations: gv – gonovectis; 
m.IX-X – pair of intersegmental muscles going from sternum IX to unpaired apodeme of paraprocts (there is no styligeral muscle ventrad of them); usg – unistyliger; usg.a – anterior margin of unistyliger.