How Many Legs Does a Spider Have? - Functions, Structure, Characteristics (2024)

Facts about the animal kingdom

By Nick A. Romero, Biologist and environmental educator. December 14, 2022

How Many Legs Does a Spider Have? - Functions, Structure, Characteristics (2)

Spiders are a very extensive and diverse group of arthropods belonging to the class Arachnidae. There are more than 45,000 known species of spiders that occur in habitats around the world. Although all spiders are more or less venomous, only a few of them are dangerous to humans. They are known to be venomous, to build silk webs, and to gracefully climb all sorts of surfaces with their legs. But because they are such a heterogeneous and numerous group, they are also very diverse. Many people wonder how many legs spiders have and if all spiders have the same number.

In the following article from AnimalWised, you will learn all about spider legs, their number, structure, as well as some other important characteristics of these animals.

You may also be interested in: How Many Legs Does a Crab Have?


  1. Features of the legs of spiders
  2. Characteristics of the legs of the spiders
  3. Do spider legs grow back?

Features of the legs of spiders

Many people mistakenly believe that spiders are insects. However, a spider is not an insect, but an arthropod. The term arthropod comes from the Greek words "arthron" (joint) and "pous" (foot) and means "jointed foot or leg." Spiders are characterized by these jointed appendages, which are used not only for locomotion, but also for weaving webs, holding their prey, and even for courtship.

The number of legs in arthropods can vary by group. Spiders have four pairs of legs, for a total of eight legs.

Continue reading this other article if you want to know how many eyes spiders have.

How Many Legs Does a Spider Have? - Functions, Structure, Characteristics (3)

Characteristics of the legs of the spiders

Unlike insects, spiders have two body segments. The anterior segment is called the cephalothorax. This is where the eyes, fangs, stomach, brain, and glands that produce venom are located. The legs are also connected to this part. The second part of the body is called the abdomen. At the rear end of the abdomen are the spinnerets, the silk glands.

Spiders do not have a skeleton inside their body. They have a hard outer shell called exoskeleton. Because it is hard, it cannot grow with the spider. So young spiders must shed their skin or shed their exoskeleton.

Parts of a spider's legs

The legs of spiders consist of eight segments. Beginning with the end of the body, these are:

  • Coxa
  • Trochanter
  • Femur
  • Patella
  • Tibia
  • Metatarsus
  • Tarsus
  • Pretarsus

The legs of the spider are covered with many hairs. The hairs pick up vibrations and odors from the air. There are at least two small claws on the ends of the legs. Also, spiders have 48 knees, that is, six joints in each of the 8 legs. Another characteristic of spider legs is that they are not branched, but tubular and, as we have seen, multipartite.

How long is the leg of a spider?

On the other hand, the size of the legs in spiders varies considerably from one species to another. For example, in jumping spiders (family Salticidae) the legs are very short, while in funnel web spiders (family Agelenidae) and cellar spiders (family Pholcidae) their legs are extremely long.

Functions of spider legs

As we have already mentioned, the legs not only provide the mobility of the spiders. The distal end of the claw plays a role in weaving the characteristic webs of these animals.

As mentioned earlier, the legs also have tactile receptors that provide them with information about the environment, such as moisture levels, the presence of prey, or predators. This is crucial because most spider species do not have good vision.

These tiny hairs also allow spiders to walk on any surface, even upside down. These tiny hairs create multiple points of contact between the spider and the surface, allowing it to easily hold on. In fact, a spider can hold twice its weight while upside down and not fall off. These hairs are small and flexible. This allows them to hold on tightly enough to not fall, while releasing quickly enough to catch their prey.

You may be interested in this other article, where we explain the anatomy of the spider body in more detail.

How Many Legs Does a Spider Have? - Functions, Structure, Characteristics (4)

Do spider legs grow back?

Loss of legs is a common phenomenon in spiders, and depending on the species, 5 to 40% of adults may have at least one missing leg.

Spiders can regenerate their amputated legs as long as they have not been completely lost, that is, only a fragment has been severed. The process occurs slowly, and can only take place if the spider is still shedding its exoskeleton, since regeneration is only possible when the exoskeleton is detached. Because of the great diversity among these arachnids, it is not known whether all spiders have this regenerative ability.

Since spider legs serve so many functions, it would be logical that spiders who lose a leg would suffer. However, this is not always the case. Recent studies have shown that spiders that have lost one or two legs can survive more or less effortlessly. The webs of these spiders that are missing a leg are not very different from the webs of spiders with intact legs. They can also hunt efficiently enough.

It has also been noted that certain spiders have the ability to amputate a leg when they have suffered an injury, especially the young spiders. In contrast, older spiders are unlikely to sever a leg even though they are injured. This probably has to do with the regenerative ability of the animal, which is more effective in younger spiders. Moreover, regeneration has energetic costs that take away resources for survival, growth, and reproduction.

If you want to learn even more about spiders, do not miss the following article, where we talk about how spiders reproduce.

If you want to read similar articles to How Many Legs Does a Spider Have?, we recommend you visit our Facts about the animal kingdom category.


  • Melic, A.; Barrientos, J.; Morano, E.; Urones, C. (2015). Order Araneae . Available at:
  • Nat Geo (2011). Spiders evolved spare legs . Available at:
  • Pechmann, M.; Khadjeh, S.; Sprenger, F.; Prpic, N. (2010). Patterning mechanisms and morphological diversity of spider appendages and their importance for spider evolution. Available at:
  • Royal Spanish Academy (2022). arthropod . Available at:
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How Many Legs Does a Spider Have? - Functions, Structure, Characteristics (2024)


How many legs does a spider have? ›

Spiders: Spiders belong to the class of arachnids. All arachnids, have eight legs. Though spider falls under the phylum of Arthropoda, which has only 6 legs the spiders have 8 legs.

What is the structure of a spider's legs? ›

Like all arachnids, spiders have 8 legs, all of which are attached to the cephalothorax. Each leg is made up of 7 segments (shown above). Attached to the cephalothorax is the coxa, followed by the trochanter, femur, patella, tibia, metatarsus, and tarsus.

Does a spider have 12 legs? ›

All spiders (and arachnids) have eight legs, and almost all of them have eight eyes, but beyond these similarities there's a lot of variation among the approximately 50,000 spider species inhabiting Earth.

What is the characteristics of spider? ›

Spiders have:

two main body parts, the head and thorax combined called the cephalothorax and an abdomen. eight walking legs. simple eyes; spiders usually have eight eyes (some have six or fewer), but few have good eyesight. jaws adapted for tearing or piercing prey.

What is the structure of a spider? ›

Spider body parts

Unlike an insect, the spider's body is in two sections. The head and thorax, bearing the eyes, mouthparts and legs, are fused together to form the cephalothorax.

Can a spider have 10 legs? ›

Although the common name given to these spiders may not conjure up anything intimidating, camel spiders are, perhaps, the most intimidating spiders that have ever been described by researchers. These spiders possess ten legs, and the have the largest jaws of any arachnid species.

How do spider legs function? ›

This is the key point about any hydraulic system: As the fluid is pushed into another space, it transmits a force. So instead of using muscles to extend its major leg joints, the spider squeezes on the fluid in its prosoma; the hemolymph is forced out and down the legs, pushing the leg joints outward.

What is the structure and function of the spider web? ›

Most spiders have three pairs of spinnerets, each having its own function – there are also spiders with just one pair and others with as many as four pairs. Webs allow a spider to catch prey without having to expend energy by running it down, making it an efficient method of gathering food.

Do spider legs have muscles? ›

For those that don't know, legs of spiders have only flexor muscles (those that constrict the leg) but don't have extensors (the ones that make them straight). To counteract them, they pump hemolyph (their equivalent of blood) into the legs, the hydraulic pressure makes them straight.

Do spiders have stomachs? ›

Cephalothorax - the fused head and thorax, also called the prosoma. It contains the brain, jaws, eyes, stomach, and leg attachments. Abdomen - the belly, also called the opisthosoma. It contains the guts, heart, reproductive organs, and silk glands.

Do spiders have a heart? ›

In all spiders the abdomen contains a tube-shaped heart, which usually has a variable number of openings (ostia) along its sides and one artery to carry blood (hemolymph) forward and one to carry it backward when the heart contracts.

Do spiders have blood? ›

Circulation. Spiders, like most arthropods, have an open circulatory system, i.e., they do not have true blood, or the veins which transport it. Rather, their bodies are filled with haemolymph, which is pumped through arteries by a heart into spaces called sinuses surrounding their internal organs.

What are 3 characteristics of spiders? ›

Spiders are characterized by:
  • Two body parts.
  • Eight legs.
  • Chelicerae or fangs.
  • No wings.
  • No antennae.

Do all spiders have teeth? ›

In its most common use, spiders bite their prey and inject venom, which immobilizes the prey and starts the process of digestion. Spiders have no teeth and rely on the venom to liquefy their prey in order that their stomachs, known as sucking stomachs, can draw in the meal.

What do spider bites look like? ›

Spider bites often look like other bug bites, but sometimes two puncture marks will be visible. Further reactions can occur, such as swelling, pain, fever, and other symptoms, depending on the spider.

Do spiders have 8 legs or 6? ›

So what made spiders settle for eight legs? "I think the best answer and the simplest answer is that spiders have eight legs because their parents did," Thomas Hegna, an assistant professor of invertebrate paleontology at the State University of New York at Fredonia, told Live Science.

Do spiders have 3 or 4 legs? ›

Basic characteristics of arachnids include four pairs of legs (1) and a body divided into two segments: the cephalothorax (2) and the abdomen (3).

Do spiders have 8 eyes or 8 legs? ›

- Okay, most spiders have eight eyes. It's like the second thing you learn after spiders have eight legs. But most types of spiders don't actually rely on vision as their number one sense. They detect vibrations in their surroundings using tiny hairs, or they smell chemicals in their environment.

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