Mitochondrial structure and density in the flight muscles of two butterfly species with dissimilar flight behaviours.

<p>(A) Microscopic images of flight muscle of the Glanville fritillary (a, c) and the Red Admiral (b, d). Mitochondria (m and arrows), sarcoplasmic reticulum (s) and myofibrils (my) are indicated. Bars are 500 nm in a and b, 1 µm in c and d. (B) Distribution of mitochondrial profiles from thin sections of the flight muscle.