CLADOENDESIS OF EPHEMEROPTERA
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Fig. 98–105. Procloeon (Securiops) mutadens. 98–99 – left and right mandibles; 100 – labrum; 101 – maxilla; 102 – larval cuticle of metanotum with vestige of hind protopteron; 103 – abdominal tergum V; 104 – abdominal sternum V; 105 – caudalii. Abbreviation: sc – scales and scale sockets.