CLADOENDESIS OF EPHEMEROPTERA
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Fig. 33–41. Baetis (Tenuibaetis) ursinus. 33 – subimaginal exuviae of half of mesonotum; 34 – hind wing of male; 35 – hind wing of female; 36 – male imago and its spread abdomen; 37–38 – its fore and middle legs; 39–40 – their subimaginal exuviae (the same magnification); 41 – female imago.