CLADOENDESIS OF EPHEMEROPTERA
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Fig. 13–21. Imaginal hind wings and larval protoptera (under the same magnification). 13–14 – female Baetis (Tenuibaetis) frequentus from India; 15–17 – male B. (T.) octomaculatus; 18–19 – female of same species; 20–21 – male B. (T.) bialatus (13, 15, 20 – metathorax of imago with hind wing; 14, 21 – larval exuviae of metanotum; 16, 18 – hind wing of imago; 17, 19 – cuticle from metathorax of larva ready to molt to subimago, with subimaginal wing inside protopteron: crumpled on Fig. 17, non-crumpled on Fig. 19).