Formicidae

Definition

The family of eusocial hymenopteran insects comprising all ants, characterized by geniculate (elbowed) antennae, a constricted petiole forming a distinct node-like waist, and complex colonial organization with reproductive queens, workers, and brood. Formicidae is distinguished from other aculeate Hymenoptera by its metapleural glands and, in most species, the absence of wings in workers. The family contains more than 13,800 described species across approximately 20 extant subfamilies, ranging from minute cryptic species to large army ants and leafcutter ants.

Etymology

From Latin formica (ant) + -idae (family suffix)

Example

Wood ants of the genus Formica (Formicidae) construct large mound nests and tend aphids for honeydew, illustrating the family's characteristic mutualistic behaviors.

Synonyms

• Ants (vernacular)

Related Terms

• Hymenoptera
• Aculeata
• Eusocial
• Petiole
• gaster
• pheromone
• castes
• Myrmecology
• Vespoidea
• Apoidea

Usage Notes

Formicidae is universally treated as a family within Hymenoptera; earlier classifications placed it in the superfamily Formicoidea, but modern phylogenetics recognizes it within Vespoidea. The term formicid (noun or adjective) refers to members of this family. Workers are wingless and typically sterile, distinguishing them from reproductive alates (queens and males).