Coiling into a sphere: defensive behavior of a trash-carrying chrysopid larva Leucochrysa (Nodita) pavida (Neuroptera: Chrysopidae)

The trash packet that many chrysopid larvae carry on their backs is a defensive device. The larvae use the packet as a shield, which they interpose between themselves and attacking ants by tilting the body in the appropriate direction. Leucochrysa (Nodita) pavida is anomalous in that it uses its packet as a wraparound by coiling into a sphere when attacked. The response, which leaves the larva entirely concealed by the packet, is effectively protective. Coiling protects other arthropods against ants as well.