FIGURES 15–30 in South American Caenis Stephens (Ephemeroptera, Caenidae), new species and stage descriptions

FIGURES 15–30. Caenis burmeisteri. Male imago: 15, genitalia, v.v.; 16–18, detail of forceps, v.v. Nymph: 19, detail of anteromedian emargination of labrum; 20, labrum, d.v.; 21, hind coxa; 22, middle coxa; 23, foreleg; 24, middle leg; 25, hind leg; 26, microtrichia on submarginal ventral row of gill II; 27, gill II, d.v.; 28, foreclaw; 29, middle claw; 30, hind claw.