Fig. 4From: The function of wing bullae in mayflies (Insecta: Ephemeroptera) reveals new insights into the early evolution of PterygotaBullae sc, r2, r4 + 5, and mp1 under SEM, A–D Ephemera danica, subimago, ventral view, E–H Ephemera danica, imago, ventral view, I–L Ephemera danica, imago, dorsal view, M–P Siphlonurus croaticus, imago, ventral view. A–L and M–P in same magnificationBack to article page