Insect | Definition, Characteristics, Types, Beneficial, Pest ...
2024年12月7日 · Insect, any member of the class Insecta, the largest class of phylum Arthropoda. Insects have segmented bodies, jointed legs, and exoskeletons. They are distinguished from other arthropods by their body, which has three major regions: the head, the three-segmented thorax, and the many-segmented abdomen.
Classification of insects | Britannica
insect, Any member of the class Insecta, the largest arthropod class, including nearly 1 million known species (about three-fourths of all animals) and an estimated 5–10 million undescribed species.
Insect - Orders, Morphology, Behavior | Britannica
2024年12月7日 · Insect - Orders, Morphology, Behavior: The class Insecta has about 1,000,000 named species and is divided into the subclasses Apterygota and Pterygota. The homopteran and heteropteran orders are sometimes considered suborders of an order Hemiptera.
Insect - Diversity, Adaptations, Habitats | Britannica
2024年12月7日 · Animal Diversity Web - Insecta Science Kids - Fun Science and Technology for Kids - Fun Insect Facts for Kids Purdue University - Youth and Entomology - How to Make an Awesome Insect Collection
list of insects - Encyclopedia Britannica
2024年12月9日 · Insects (class Insecta) have segmented bodies, jointed legs, and external skeletons. Insects are distinguished from other arthropods by their body, which is divided into three major regions: (1) the head, which bears the mouthparts, eyes, and a pair of antennae, (2) the three-segmented thorax,
Insect - Metamorphosis, Adaptation, Morphology | Britannica
2024年12月7日 · Insect evolution has paralleled that of the flowering plants. Insects exhibit a balanced genetic polymorphism. The class Insecta is divided into orders based on the structure of the head, thorax, abdomen, type of metamorphosis, and form of larva and pupa.
Insect - Fossil, Adaptation, Evolution | Britannica
2024年12月7日 · Insect - Fossil, Adaptation, Evolution: The insect fossil record has many gaps. The primitive wingless insects gave rise to paleopterous and neopterous stock fossil types. Ten insect orders are known as fossils, mostly of Late Carboniferous and Permian times. Insect wings develop as paired outgrowths from the thorax, stiffened by ribs, or veins, in which run tracheae.
Insect - Pollination, Adaptation, Nutrition | Britannica
2024年12月7日 · Insect - Pollination, Adaptation, Nutrition: Insects are a food source as well as a source of raw materials. They are used for the production of dyes, wax, and silk. Honeybees pollinate fruit trees and other crops. Insects become pests by damaging stored food, garments, and other commercial products. Nonnative insect pests introduced to an agricultural …
Arthropod - Insects, Crustaceans, Arachnids | Britannica
2024年12月16日 · Class Insecta Body composed of a head, thorax, and abdomen; head bears simple eyes and usually a pair of lateral compound eyes; 2 pairs of maxillae, the second pair fused (labium); thorax of 3 segments, each with a pair of legs, and the second and third usually bearing wings; abdomen of 11 segments without appendages in the adult; gonopore at ...
Description, Life Cycle, Species, Diseases, & Facts - Britannica
2024年12月9日 · The eggs are laid on the surface of water and hatch into aquatic larvae, or wrigglers, which swim with a jerking, wriggling movement.In most species, larvae feed on algae and organic debris, although a few are predatory and may even feed on other mosquitoes. Unlike most insects, mosquitoes in the pupal stage, called tumblers, are active and free-swimming.
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