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Gli insetti o entomi ( Insecta Linneo, 1758) sono una classe di animali appartenenti al grande phylum degli Arthropoda. Questa classe rappresenta il più grande tra i raggruppamenti di animali che popolano la Terra, annoverando oltre un milione di specie, pari ai cinque sesti dell'intero regno animale .
Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen ), three pairs of jointed legs, compound eyes, and a pair of antennae. Insects are the most diverse group of animals, with more than a million described species; they represent more than half of all animal species.
Insects are the largest group of animals on Earth by far: about 926,400 different species have been described. [3] They are more than half of all known living species. [4] [4] [5] [6] [7] They may be over 90% of animal species on Earth. [8] New species of insects are continually being found. [9]
Insect evolution is characterized by rapid adaptation due to selective pressures exerted by the environment and furthered by high fecundity. It appears that rapid radiations and the appearance of new species, a process that continues to this day, result in insects filling all available environmental niches.
External links. Beetles are insects that form the order Coleoptera ( / koʊliːˈɒptərə / ), in the superorder Holometabola. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects.
Articles relating to insects, pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen ), three pairs of jointed legs, compound eyes and one pair of antennae .
Brachycera. An Anthomyiidae species showing characteristic dipteran features: large eyes, small antennae, sucking mouthparts, single pair of flying wings, hindwings reduced to clublike halteres. Flies are insects of the order Diptera, the name being derived from the Greek δι- di- "two", and πτερόν pteron "wing".
