CLADOENDESIS OF EPHEMEROPTERA
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Fig. 281–287. Centroptella (Crassolus) saxophila. 281–282 – left and right mandibles (arrow shows tuft of setiform processes on proximal angle of mola); 283 – maxilla; 284 – labium; 285 – labrum; 286–287 – left and right mandibles of penultimolarva before molt to ultimolarva (with mandibles of next instar inside). Abbreviations: in1–in4 – denticles of incisor; kd1–kd3 – denticles of kinetodontium.