CLADOENDESIS OF EPHEMEROPTERA
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Fig. 31–39. Procloeon (Securiops) falcatum, larval mouthparts. 31 – apex of labrum, ventral view; 32 – labrum, dorsal view; 33 – apex of labrum, enlarged; 34–35 – left and right mandibles; 36 – maxilla; 37–38 – apex of maxilla with focus on ventral and dorsal sides; 39 – hypopharynx with superlinguae. Abbreviations: can – maxillary canines; ds1 – ds2, ds3 – 1st–3rd dentisetae.