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SUMMARY

Camptocercus lilljeborgi has a long, extremely motile post-abdomen. The movements of the post-abdomen keep the carapace free from epibionts, keep the food groove between the thoracic limbs clear, and may be of use in escaping from certain small predators. There is a complex joint between the abdomen and post-abdomen. The muscles moving the post-abdomen are described and homologized with those of Eurycercus lamellatus and Daphnia magna.