Abstract
The respiratory and non-respiratory dorso-ventral muscles of the dragonfly larva have certain features in common. Nevertheless they differ in a number of ways. Thus the respiratory muscle is heavily tracheated and has nine to ten actins surrounding each myosin filament, a poorly developed sarcoplasmic reticulum, numerous mitochondria regularly arranged on each side of the Z lines and abundant glycogen. On the other hand the non-respiratory muscle has ten to twelve actin filaments in each array, both tubular systems are well developed, there are fewer mitochondria and glycogen is less abundant. The significance of these differences and a possible scheme for classifying insect muscles are discussed.
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