Chalcididae
Encyclopedia
The Chalcididae are a moderate-sized family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 within the Chalcidoidea, composed mostly of parasitoid
Parasitoid
A parasitoid is an organism that spends a significant portion of its life history attached to or within a single host organism in a relationship that is in essence parasitic; unlike a true parasite, however, it ultimately sterilises or kills, and sometimes consumes, the host...

s and a few hyperparasitoid
Hyperparasite
A hyperparasite is a parasite whose host is a parasite. This form of parasitism is especially common among entomophagous parasites....

s. The family is apparently polyphyletic, though the different subfamilies may each be monophyletic, and some may be elevated to family status in the near future. As presently defined, there are over 85 genera and over 1455 species worldwide. They are often black with yellow, red, or white markings, rarely brilliantly metallic, with a robust mesosoma
Mesosoma
The mesosoma is the middle part of the body, or tagma, of arthropods whose body is composed of three parts, the other two being the prosoma and the metasoma. It bears the legs, and, in the case of winged insects, the wings....

 and very strong sculpturing. The hind femora
Arthropod leg
The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments are of Latin origin, and may be confused with terms for bones: coxa , trochanter , femur, tibia, tarsus, ischium, metatarsus, carpus, dactylus ,...

 are often greatly enlarged, with a row of teeth or serrations along the lower margin.

One of the more remarkable uses of the muscular hind legs is the species Lasiochalcidia igiliensis, which attacks the dangerous, predatory larvae of ant lions, holding the mandibles of the larva spread apart while the wasp carefully injects an egg into the membrane of the exposed throat.

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