Like all limacodids, the legs are shortened and the prolegs are reduced to suction cups. A high proportion of larvae have parasitoids. Their presence can be determined before emergence by a black spot formed by the breathing siphon of the fly.
This passage describes the unique characteristics of limacodids, particularly their legs, prolegs, and larval parasitism. A distinctive feature is the black spot formed by the fly's breathing siphon that can be used to identify their presence before they emerge.