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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]
The evolution of insects is closely related to the evolution of flowering plants. Insect adaptations include feeding on flowers and related structures, with some 20% of extant insects depending on flowers, nectar or pollen for their food source.
The smallest recorded beetle and the smallest free-living insect (as of 2015), is the featherwing beetle Scydosella musawasensis which may measure as little as 325 μm in length. [25] Titan beetle , Titanus giganteus , a tropical longhorn , is one of the largest and heaviest insects in the world.
External links. Coccinellidae ( / ˌkɒksɪˈnɛlɪdiː /) [3] is a widespread family of small beetles. They are commonly known as ladybugs in North America and ladybirds in the United Kingdom; "lady" refers to mother Mary. Entomologists use the names ladybird beetles or lady beetles to avoid confusion with true bugs.
Diptera is one of the major insect orders and of considerable ecological and human importance. Flies are important pollinators, second only to the bees and their Hymenopteran relatives. Flies may have been among the evolutionarily earliest pollinators responsible for early plant pollination .
