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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.
May 3, 2024 · insect, (class Insecta or Hexapoda), any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. Insects have segmented bodies, jointed legs, and external skeletons (exoskeletons).
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.
Insects diversified in only about 100 million years into essentially modern forms. Insect evolution is characterized by rapid adaptation due to selective pressures exerted by the environment and furthered by high fecundity.
Estimates of the total number of species range from 2 million to 30 million. All adult insects have six legs; and most have wings. Insects were the first animals capable of flight . As they develop from eggs, insects undergo metamorphosis. Insects live all over the planet: almost all are terrestrial (live on land).
Scientists study insects from all over the world, alive and extinct, to understand how insects have changed over time. They examine key features that we learned about today to learn more about these insects and their habitats, behaviors, what they eat, and even what other insects they're related to.
Beetles, the order Coleoptera, are the largest group of insects. There are 350,000 different species of beetles which have been named: about 40% of all known insects. There are an estimated 800,000 to a million living species. Beetles live almost everywhere, though not in the ocean or in places that are very cold, such as Antarctica.
