CLADOENDESIS OF EPHEMEROPTERA
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Fig. 419–420. Centroptella (Crassolus) pontica. 419 – larval metanotum with pair of bifurcate setae corresponding to f on Fig. 14 (SEM picture by R. Godunko); 420 – fragment of male larval abdominal sternum IX with remnant of subimaginal gonostylus developing under larval cuticle (photo by P. Sroka). Abbreviations: gs1–gs3 – segments of gonostyli; usg – unistyliger.