Why are spiders animals and not insects?

A spider is not an insect because the definition of an insect is "a body with three heads, a thorax and an abdomen, two pairs of wings and three pairs of legs; 1 pair of antennae cephalic, bones wrapped around the outside of the body; The form of life is varied, and it is spread all over the world. "Spiders do not fit the above characteristics. However, spiders, like insects, belong to the large family of invertebrate arthropods, indicating that there are many commonalities between the two, and many Westerners, including the famous Fabre, have classified spiders and scorpions as "insects", which fully shows that the relationship between them is very close.

Spiders belong to the arachnids of the phylum Arthropods and belong taxonomically to adjacent groups in the large family with insects.

Spiders are not insects, they belong to arthropods.

Arthropods are a large group of animals, and exoskeletons such as hexapod (insects, etc.), crustacean (shrimp, crabs, etc.), chelicerae (spiders, scorpions, etc.), myriapod (centipedes, horses, etc.) and other exoskeleton animals are called arthropods, and they are also the most species-related phylum in the animal kingdom, which is characterized by segmented limbs.

There are about 1.1 million to 1.2 million extant species of arthropods worldwide, accounting for 75 to 80% of the total number of living species. They live in a wide range of environments, whether it is seawater, fresh water, soil, or the air, and some species also parasitize other animals in or outside the body.

Spiders

Spiders, arachnids of the phylum Arthropoda, are the most abundant predatory predators in terrestrial ecosystems. Its body length varies from 1 to 90 mm, and its body is divided into cephalothorax and abdomen, and it is extremely sensitive to the living environment.

Because spiders are highly sensitive to changes in environmental factors including habitat structure, habitat type, wind, humidity and temperature, they can be used as indicator groups to monitor habitat and biodiversity changes, and their species composition and population changes have become important indicators for environmental monitoring, which can well reflect the process of environmental change and its impact on biodiversity.

Arthropoda, arachnida, arachnida, a common name for all species.

Spiders are generally considered to be insects, but they are not insects, just like scorpions and centipedes. Because the basic characteristics of insects are three parts of the body, head, thorax, abdomen, two pairs of wings and six legs.

Spiders are not insects, but belong to the class Arachnids among arthropods. Flies, mosquitoes, crickets, bees, etc., are our most common insects, and they belong to the class of insects in arthropods. Spiders and insects belong to different branches in arthropods.

Spiders belong to the category of arthropods.

1. The spider is an animal of the arachnida, it is not an insect, and belongs to the arachnid order of the Arachnida.

2. There are 42 phyla in the animal kingdom, and spiders are the general name of all families, genera, and families of the phylum Arthropods - Arachnids - Arachnids, genera, and families, and according to the natural classification method, organisms are divided into seven main levels, such as boundary, phylum, class, order, family, genus, and species.

3. Arachnids of the order Myriapod. With the scorpion is a close relative, the invertebrate in the class Arachnids.

1. Spiders are not insects, but animals belonging to the class Arachnids of the phylum Arthropods.

2. The body of an insect is divided into three parts: head, thorax, and abdomen, and usually has two pairs of wings and three pairs of legs (six legs), while a spider has four pairs of legs, so spiders do not belong to insects.

3. Spider is the common name of all species of Arthropoda, Arachnida, Aranida or Araneae. Worldwide except Antarctica. It is distributed from sea level to 5,000 meters above sea level.

All terrestrial. Body length 1 90 mm. Spiders are both beneficial and harmful to humans, but in terms of their contribution, they are mostly beneficial insects.

The length of the spider varies from millimeters to 60 millimeters. The body is divided into cephalothorax and abdomen. Some species have a cuirasax on the back of the cephalothorax (some do not), and the anterior end of the cephalothorax usually has 8 monocular eyes (there are also 6, 4, 2, 0) in 2 4 rows.

Spiders belong to the class of arachnids, and insects belong to the class of insects, which are creatures of the same phylum Arthropod, and you can say that they are relatively close. The taxonomic hierarchy is from large to small: the smaller the phylum, the closer the kinship.

Spiders are not insects, they belong to arthropods.

It's actually quite simple! Spiders are not insects! All members of the insect family have such a condyle point, that is, the whole body of the adult worm is divided into:

There are three parts of the head, thorax, and abdomen, and there are six legs and two pairs of wings growing on the chest. On the insect's head, there is also a pair of flexible antennae and two strange abdominal eyes. Why is it said that spiders are not insects?

Because spiders have 8 legs, they have neither antennae nor ventral eyes on their heads, and their heads and thorax are joined together. Moreover, spiders belong to the class Arachniformes. Inside the spider:

The body of the arachnid is divided into three parts: anterior, middle, (cephalothorax), and posterior (abdomen). Spider animals have four pairs of legs. Life Cycle of a Spider:

Arachnids, such as spiders, lay eggs that hatch into small spiders. After several shedding of their skin, they grow into large spiders. Moreover, spiders belong to the category of arthropods.

Arthropods are made up of body structures and have a harder shell. As arthropods grow, they shed their shells. Arachnids include:

Spiders, mites, scorpions, etc. There are 73 000 species divided into 10 orders, of which 4 are ordered. Name:

Species: Scorpion (Scorpion) 2 000 Arachnida (Spider) 40 000 Blind Spider (Blind Spider) 4 500 Sun Spider (Sun Spider) 900

Spiders are, of course, animals, and insects are animals. From the classification of animals, spiders and insects are both arthropods, but spiders belong to the class Arachniforma, whereas insects are insecta. The most obvious difference between the two is that spiders have eight legs, while insects have six legs.

Spiders are animals. Spiders belong to the class Arachnids in arthropods. The spider's body is divided into only two parts, i.e., the head and thorax are combined into one part and the other is the abdomen.

Spiders do not have antennae and wings. Spiders have four pairs of legs, one more than insects. So, by the standard of insects, spiders cannot be called insects.

Spiders feed on insects, other spiders, myriapods, and some spiders also feed on small animals. Jumping spiders have good eyesight and can dive up to 30 cm to catch their prey.

LifestyleThe lifestyle of spiders can be divided into two main categories. That is, the nomadic type and the sedentary type. Safari type spiders, spiders that hunt everywhere, hunt, have no fixed residence, do not build webs, do not burrow, and do not build nests.

There are scaly arachnidae, ursoaradae and most tarantulas. Sedentary: some build nets, some dig holes, and some build nests as fixed dwellings.

Such as wall money, stone-like spiders, etc.

Spiders seem to be polite, and those who live independently keep a certain distance from each other and do not invade each other. Compared to ordinary insects, spiders are long-lived, most spiders complete a life cycle, generally 8 months to 2 years, and male spiders are short-lived and die soon after mating. Others such as water spiders and cunning spiders can live for 18 months, burrowing tarantulas can live for 2 years, cancer spiders can live for more than 2 years, and birdcatcher spiders can live for up to 20 to 30 years.