What is Insecta? What insects are not in the class Insecta?

Insecta is a class under the hexapod subphylum of the phylum Arthropods. Insecta is not only the phylum of arthropods, but also the most diverse and numerous class in the entire animal kingdom, and their traces are found in almost every corner of the world. There are now about 1 million known species of insects, but many species are still to be discovered.

Insecta: Formerly known as "Hexapod", it is not only the phylum Arthropoda.

Insects are arthropods among invertebrates. The body of an insect is divided into three parts: head, thorax, and abdomen. Adults usually have 2 pairs of wings and 6 legs, the wings and feet are located on the thorax, and the body is composed of a series of body segments, which are further assembled into 3 segments.

Common ones include locusts, butterflies, bees, dragonflies, flies, grasshoppers, cockroaches, etc.

Insects: Temperature is the most important factor determining the growth and development rate of insects, and climate warming can accelerate the development of insects, resulting in the early appearance period, migration period and population peak period. Terrestrial insects look for a cool, moist place when the environment is too hot.

If exposed to sunlight, it places itself in the smallest area of the body surface heated. If it is too cold, the insects stay in the sun to keep warm. Many butterflies spread their wings to collect heat before flying.

Moths vibrate their wings or shake their bodies before flying, and use their hairs or scales to form an insulating layer of air around their bodies to retain body heat. In severe cold, freezing is the greatest danger to insects. Species that can overwinter in cold regions are called hardy insects.

1, stone silkworm 2, dung bee 3, cicada 4, plasterer bee 5, praying mantis 6, bee, cat and red ant 7, mine bee 8, firefly 9, tube worm 10, woodcutter bee 11, cotton bee and fat bee 12, Spanish rhinoceros 13, grasshopper 14, wasp 15, grub 16, cricket 17, red wasp 18, flytrap 19, parasite 20, pine caterpillar.

1. Stone silkworm: It belongs to the family of stone silkworm moths. Exterior features:

The head and prothorax are black, the wings are brown, and they are ridge-like when perched, and each foot is elongated. Living habits: The larvae are water-dwelling, and will spin the stones, fine sand, and dead branches in the stream water to bond into a nest, each species has a specific nest type, and the adults live near the stream, and the habitat is very large.

Second, dung beetles, commonly known as feces shells, belong to the Coleoptera Scarabidae. Appearance characteristics: black or black-brown body, large and medium-sized insects. Habits: Dung beetles can use the phenomenon of moonlight polarization to locate and help feed. There is a certain phototaxis.

Class 37. 1. Coleoptera is the first order in the class of insects, commonly known as "beetles". There are more than 330,000 species, accounting for 40% of the total number of insects. More than 7,000 species have been recorded in China.

2. Lepidoptera is the second largest order in the class of insects after Coleoptera, and is named because of the large number of scales on the body and wings. It is mainly divided into moths and butterflies, and the common identification feature is the siphon mouthparts.

3. Diptera includes mosquitoes, midges, gnats, flies, flies, etc., and is the larger order of insects. Because the forewings of the adult worm are membranous, the hindwings degenerate into "balance rods". Diptera are divided into three suborders: long-horned, short-horned, and annular.

4. Hymenoptera includes a variety of ants and bees. Hymenopteran insects have obvious characteristics, including chewing and sucking mouthparts, and the connection of the front and rear wings is completed by wing hooks. This group is widely distributed, with more than 100,000 known species and an estimated at least 250,000 species.

5. Hemiptera, composed of two suborders, Heteroptera and Homoptera, have 133 families and more than 60,000 species. The heteroptera is the Tsubaki. It is one of the main groups in the class Insecta. The forewings of hemipteran insects cover the back of the body when at rest, and the hindwings are hidden underneath.

6. Orthoptera is a relatively common class of insects, including mantis, crickets, mole crickets, locusts, etc., with more than 20,000 species known in the world and widely distributed. The forewings of the adult are slightly hardened, called "over-the-top wings", and the hindwings are membranous.

7. Broadptera is a small group, with only two families, Lacewings and Lacewings. It is distributed worldwide, and about 300 species have been recorded. There are more than 40 species known in China, and the common species are Palearctic Lacewing, Oriental Megalodon, Chinese Spotted Frog and so on.

8. Dragonflies are a relatively primitive group in the class of insects, and they are also a smaller order. Dragonflies are divided into three suborders: the suborder Somiptera is collectively referred to as "dragonflies"; The suborder Homoptera is collectively referred to as "cocktails" and two species of mesoptera insects found in Japan and India.

In addition to the 7 orders mentioned above, there are 27 other orders, a total of 34 orders. There are many species and different morphologies of insects, but they have an exoskeleton and three pairs of legs as their common characteristics.