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Insecta    
昆虫纲

昆虫纲

Insecta
n 1: insects; about five-sixths of all known animal species
[synonym: {Insecta}, {class Insecta}, {Hexapoda}, {class
Hexapoda}]

Insecta \In*sec"ta\, n. pl. [NL. See {Insect}.]
1. (Zool.) One of the classes of Arthropoda, including those
that have one pair of antenn[ae], three pairs of mouth
organs, and breathe air by means of trache[ae], opening by
spiracles along the sides of the body. In this sense it
includes the Hexapoda, or six-legged insects and the
Myriapoda, with numerous legs. See {Insect}, n.
[1913 Webster]

2. (Zool.) In a more restricted sense, the Hexapoda alone.
See {Hexapoda}.
[1913 Webster]

3. (Zool.) In the most general sense, the Hexapoda,
Myriapoda, and Arachnoidea, combined.
[1913 Webster]

Note: The typical Insecta, or hexapod insects, are divided
into several orders, viz.: {Hymenoptera}, as the bees
and ants; {Diptera}, as the common flies, gnats, and
mosquitos; {Aphaniptera}, or fleas; {Lepidoptera}, or
moths and butterflies; {Neuroptera}, as the ant-lions
and hellgamite; {Coleoptera}, or beetles; {Hemiptera},
as bugs, lice, aphids; {Orthoptera}, as grasshoppers
and cockroaches; {Pseudoneuroptera}, as the dragon
flies and termites; {Euplexoptera}, or earwigs;
{Thysanura}, as the springtails, podura, and lepisma.
See these words in the Vocabulary.
[1913 Webster]


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  • Insect | Definition, Characteristics, Types, Beneficial, Pest . . .
    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
  • list of insects - Encyclopedia Britannica
    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 - Diversity, Adaptations, Habitats | Britannica
    Insect - Diversity, Adaptations, Habitats: Insects have adapted to every land and freshwater habitat where food is available Their large populations and great variety are related to their small size, high reproduction rate, and abundant food supplies Insects play many important roles in nature, including decomposition, soil formation, and pollination Certain insects can be of direct benefit
  • Insect - Orders, Morphology, Behavior | Britannica
    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 - Metamorphosis, Adaptation, Morphology | Britannica
    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 - Students | Britannica Kids | Homework Help
    Insects are distinguished from other members of the animal kingdom by having six legs; one pair of antennae; a ringed, or segmented, body; and three well-defined body regions It is from the joined body rings, or segments, that insects derived their name, for the Latin word insecta means “segmented ”
  • Arthropod | Definition, Examples, Characteristics, Classes, Groups . . .
    Arthropod, any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes About 84 percent of all known species of animals are members of this phylum Learn more about arthropods in this article
  • Mosquito | Description, Life Cycle, Importance, Species, Diseases . . .
    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
  • Bee | Definition, Description, Hymenoptera, Types, Facts | Britannica
    Bees make up more than 20,000 species of insects in the suborder Apocrita (order Hymenoptera), including the familiar honeybee and bumblebee as well as thousands more wasplike and flylike bees





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