Fig. 2

Ephemera danica (Ephemeridae), forewing and bullae of subimago in ventral view after critical point drying under light microscopy. A Total view, B bullae in detailed view, C bulla sc, D bulla r2, E bulla r4 + 5, F bulla mp1. Abbreviations of veins (positive veins labeled in black, negative in white): c: costa, sc: subcosta, r: radius, ma: media anterior, mp: media posterior, C–F in same magnification