CLADOENDESIS OF EPHEMEROPTERA
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Fig. 41–43. Larval thorax of Guajirolus ektrapeloglossa from Quebrada Barrigón. 41 – exuviae of left half of pronotum and mesonotum; 42 – posterior margin of mesonotum and protoptera; 43 – exuviae of sterna and pleura (fore leg turned anteriorly, middle and hind legs detached). Abbreviations: abd1 – first abdominal tergum; msth – mesothorax; mtth – metathorax; prth – prothorax.