Abstract
The ultrastructural pathology of the flight muscles of rematode-infected fir engraver beetles has been described. The description of the normal muscle is very similar to those of asynchronous muscles. In parasitized beetles the myofibers underwent a slight relaxation, and the mitochondria were disoriented. The nuclei appear to be unchanged. There was folding of the sarcolemma and a reduced number of mitochondria in the subsarcolemmal region. The vesicles of the sarcoplasmic reticulum and T-tubules were enlarged. The mitochondria were the most affected of the sarcoplasmic organelles. They became round and the cristae were swollen. The broken cristae were also released into the sarcoplasm and interspersed among the sarcomeres after the rupture of mitochondria membranes. Intramitochondrial granules were absent. These abnormalities were attributed to hypoxic or toxic effects. The ecological and behavioral pattern of this beetle described earlier is correlated with the ultrastructural pathology of the flight muscle.
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