CLADOENDESIS OF EPHEMEROPTERA
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Fig. 303–307. Centroptella (Crassolus) saxophila. 303 – genitalia (left gonostylar and gonovectal muscles not shown); 304 – subimaginal exuviae of gonostylus; 305–306 – imaginal gonostyli of different specimens; 307 – subimaginal gonostyli crumpled under larval cuticle. Abbreviations: gs1–gs3 – segments of gonostyli; gv – gonovectis; m.IX-X – base of intersegmental muscle; m.gs – gonostylar muscle; m.gv.d – dorsal muscle of gonovectis; m.gv.v – ventral muscle of gonovectis; pb – median projection of penial bridge; pgs – larval protogonostylus; usg – unistyliger.