CLADOENDESIS OF EPHEMEROPTERA
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Fig. 43–48. Centroptella (Centroptella) longisetosa cinerea subsp. n. 43 – labium; 44–45 – left and right mandibles; 46 – genitalia (left gonostylar and gonovectal muscles not shown); 47 – their subimaginal exuviae; 48 – subimaginal gonostyli crumpled under larval cuticle. Abbreviations: gd – gonoduct; 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; m.sg – styligeral muscle; pb – median projection of penial bridge; pgs – larval protogonostylus; usg – unistyliger.