Social-insect-parasite
Guides
Apocephalus
ant-decapitating flies, scuttle flies (informal)
Apocephalus is a genus of phorid flies comprising at least 300 described species, commonly known as ant-decapitating flies. Species within this genus are primarily parasitoids of ants, with females laying eggs in hosts that subsequently develop into larvae that consume the host from within, often resulting in host decapitation. The genus has gained particular attention due to Apocephalus borealis, which parasitizes honey bees and causes aberrant nocturnal behavior leading to hive abandonment. Several species groups have been taxonomically revised, including the mucronatus group and subgenus Mesophora, with numerous new species described in recent decades.
Chalcoela
Sooty-winged Chalcoela (for C. iphitalis)
Chalcoela is a genus of crambid moths (family Crambidae, subfamily Glaphyriinae) containing at least two described species. The genus is notable for the brood parasitic biology of C. iphitalis, whose larvae are specialized predators of paper wasp (Polistes) larvae within their nests. This species represents a rare example of a lepidopteran that has evolved to exploit social hymenopteran colonies. The genus was established by Zeller in 1872.
Chalcoela iphitalis
Sooty-winged Chalcoela, Sooty-winged Chalcoela Moth
Chalcoela iphitalis is a small moth in the family Crambidae that functions as a brood parasite of social paper wasps. The species is notable for its striking coloration: the head, thorax, and anterior forewings are yellow-orange, while the posterior forewings and hindwings are gray-silver with black marginal spots. Adults are active from May to August across North America. The larvae are specialized predators of wasp pupae and pre-pupae within Polistes and Mischocyttarus nests, and represent a rare case of a lepidopteran acting as a parasitoid of hymenopterans.
Eucharitinae
Eucharitinae is a subfamily of chalcid wasps within Eucharitidae, established by Walker in 1846. Members are parasitoids of ants, with larvae developing inside ant colonies after being transported by worker ants. The subfamily is distinguished by specialized life history adaptations involving ant host exploitation.
Neoneurini
Neoneurini is a tribe of braconid wasps in the subfamily Euphorinae, historically treated as a separate subfamily but now placed within Euphorinae based on molecular data. The tribe contains three European genera—Elasmosoma, Kollasmosoma, and Neoneurus—comprising koinobiont endoparasitoids of adult ants. These wasps possess highly specialized morphological adaptations for attacking ants, including a strongly curved, hook-shaped ovipositor directed forward, and modified legs with vestigial tarsal claws and enlarged pulvilli for grasping ant metasomas. The tribe has a fossil record extending to Baltic amber.
Sphecophaga
Sphecophaga is a genus of ichneumonid wasps specialized as ectoparasitoids of vespid wasps. Species within this genus parasitize nests of social wasps, with larvae feeding externally on immature wasp pupae. The genus exhibits complex polymorphism in adult forms and cocoon types, and has been widely introduced as a biological control agent for invasive Vespula wasp species. Two recognized species occur: S. orientalis parasitizing Vespa orientalis in the Mediterranean region, and S. vesparum with subspecies in Europe and North America targeting Vespula species.