Figure 3

Scanning electron microscopy of a Hetaerina americana wing piece. (a) Wing veins surrounding a membrane window (bar=100 µm). (b) A sectioned window membrane, showing numerous protrusions (bar=5 µm).
Scanning electron microscopy of a Hetaerina americana wing piece. (a) Wing veins surrounding a membrane window (bar=100 µm). (b) A sectioned window membrane, showing numerous protrusions (bar=5 µm).