Insecte

Un insecte est un arthropode invertébré de la classe des Insecta, caractérisé par un corps en trois parties, six pattes à l’état adulte et, le plus souvent, une paire d’antennes et des ailes.

An insect is an invertebrate arthropod of the class Insecta, characterized by a three-part body, six legs in the adult stage, and usually a pair of antennae and wings. Insects constitute one of the most diverse animal groups, with about one million described species and likely many more yet to be discovered.

Classification and definition

Insects form a class of arthropods, often placed in the subphylum Hexapoda. Lexicographic and zoological definitions converge on the characteristics of a three-part body and six legs.

Anatomy

A typical insect has a head with antennae and mouthparts, a thorax bearing legs and often wings, and a segmented abdomen. Their body is protected by a chitinous exoskeleton.

Diversity

Insects constitute a major part of animal biodiversity. About one million species have been described, and estimates indicate that there are likely several million more.

Entomology and ecological role

Entomology is the branch of zoology dedicated to insects. Insects include social groups such as bees, ants, and termites, and play essential ecological roles.