Aphelinidae

Definition

A family of minute parasitic wasps in the order Hymenoptera, comprising approximately 1,100 described species in 34 genera. Members are primary parasitoids, predominantly attacking Hemiptera, though host ranges and life histories vary considerably; males and females may develop on different hosts. The extremely small body size and rapid postmortem deterioration make these wasps challenging to identify from preserved specimens, requiring specialized slide-mounting techniques for reliable taxonomy.

Etymology

Example

Encarsia formosa, an aphelinid widely used in biological control, parasitizes whiteflies (Aleyrodidae) by laying eggs in nymphal hosts.

Related Terms

• Parasitoid
• Hymenoptera
• Chalcidoidea
• Encarsia
• Biological control
• whitefly parasitoid

Usage Notes

Aphelinidae are classified within the superfamily Chalcidoidea, though their precise phylogenetic placement among chalcidoid families remains under study. The family is distinguished from similar small parasitoid families by wing venation and antennal segmentation, characters often requiring microscopic examination. Many species are economically important as biocontrol agents against agricultural pests, particularly armored scales and whiteflies.