CLADOENDESIS OF EPHEMEROPTERA
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Fig. 29–35. Labium of Guajirolus ektrapeloglossa from Quebrada Barrigón. 29–31 – labium (29, ventral view; 30–31, in translucent light, with focus on glossae and on palps); 32–33 – one and the same labial palp differently compressed; 34–35 – left and right labial palps of one and the same individual.