CLADOENDESIS OF EPHEMEROPTERA
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Kluge 2019: Figs 1-3 4-11 12-16 17-21 22-28 29-35 36-40 41-43 44-50 51-58 59-69 70-74 75-80 81-82 83-88  

Fig. 17–21. Guajirolus ektrapeloglossa from Quebrada Barrigón. 17 – maxilla (dorsal view); 18 – apex of maxilla (ventral view); 19 – distal margin of labrum (dorsal view); 20–21 – biting denticles of left and right mandibles. Abbreviations: 1d – distal subsegment of first palpomere; 1p – proximal subsegment of first palpomere; 2 – second palpomere; ds1, ds2, ds3 – dentisetae; in – incisor; kd – kinetodontium; prs – prostheca.