Predatory Behavior ofCanthon virens(Coleoptera: Scarabaeidae): A Predator of Leafcutter Ants

Abstract

We present a detailed description of the predatory behavior of the beetleCanthon virensMannerheim, 1829, on the leafcutter antAttasp. We observed 51 acts of predation, which were also recorded on film and subjected to behavioral analysis.Canthon virensexhibited 28 behaviors while predating uponAttasp. queens. Adult beetles search for queens while flying in a zigzag pattern, 15 to 20 cm above the ground. After catching a queen, the predator stands on its back and starts cutting the queen cervix. Once the prey is decapitated, the predator rolls it until an insurmountable obstacle is reached. The distance from the site of predation to the obstacle can vary widely and is unpredictable. The beetle rolling the queen also buries it in a very peculiar way: first, it digs a small hole and pulls the queen inside, while another beetle is attached to the prey. The burial process takes many hours (up to 12) and may depend on the hardness of the soil and the presence of obstacles. In general, one or two beetles are found in a chamber with the queen after it is buried. They make the brood balls, which serve as food for the offspring. This study contributes to the knowledge of the predatory behavior ofCanthon virens, a predator poorly studied in Brazil and widespread in the country.