CLADOENDESIS OF EPHEMEROPTERA
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Fig. 22–30. Baetis (Tenuibaetis) ursinus, larval exuviae (24–29 – one and the same magnification). 22 – labrum; 23 – maxilla and labium; 24 – abdomen, 25–27 – middle and hind legs; 28 – half of pronotum and mesonotum; 29 – head; 30 – paraproct.