Nest-parasitism
Guides
Argochrysis armilla
Argochrysis armilla is a cleptoparasitic wasp in the family Chrysididae that specializes in attacking ground-nesting sphecid wasps of the genus Ammophila, particularly A. dysmica. This species has evolved sophisticated behavioral adaptations to overcome the temporal and spatial defenses of its hosts, including visual location of digging hosts, spatial learning of nest locations, and surveillance of multiple nests during host absence. Its foraging strategy creates strong selective pressure on host nesting behavior, favoring delayed provisioning and dispersed nest placement. The species was described by Bohart in 1982 and remains poorly known from a natural history perspective beyond its host interactions.