Arsenura armida

Description

Arsenura armida, the giant silk moth, is a moth of the family Saturniidae. It is found mainly in South and Central America, from Mexico to Bolivia, and Ecuador to south-eastern Brazil. It was first described by Pieter Cramer in 1779. It is the only known Neotropical arsenurine to exhibit a combination of strong aposematism, gregariousness, and trail-following behavior in its larval stage. The larvae are brightly colored, with bright black and yellow bands, which signal their unpleasant taste to birds. The larvae are also fatally poisonous to some species of birds. During the day, the larvae rest in large conspicuous masses on the trunks of trees, and descend at night to feed. When returning at dawn, they follow a silk-less pheromone trail to their original central place location. This social behavior is remarkable for the larvae; other members of the genus live more solitary lives. The larvae feed on Guazuma ulmifolia, Rollinia membranacea and Bombacopsis quinatum. After the larva's fourth instar, it will descend from the larval mass, excavate a small chamber in the soil and pupate. Then, shortly after the rainy season in June, the pupa will eclose (emerge). The adult form of the species are large brown moths which possess a wingspan of 100–120 mm. The adults will mate the same night they emerge, and afterwards the females will lay their eggs in large batches on the underside tree leaves. To the indigenous people of the Zongolica area of Veracruz, the larvae are also a form of sustenance; they are gathered and eaten after being cooked.