Spiders belong to the animal group called arachnids, and scientists place them in the order Araneae. If you have ever wondered what spiders are called, these names cover both their main label and the broader animal group they belong to.
People also use everyday labels like common spiders, house spiders, or dangerous spiders when talking about different species. These names help with quick identification, while Araneae and Arachnida describe the scientific classification.
The Main Names People Use
Spider names can mean different things in science and everyday speech. Scientific names place spiders within a larger animal group, while common names help people talk about familiar species at home or outdoors.
The Scientific Name: Araneae
Biologists use Araneae as the scientific order for all true spiders. This order includes more than 53,000 described species worldwide.
The Broader Group: Arachnids, Not Insects
Spiders belong to the class Arachnida, so we call them arachnids, not insects. Arachnids also include scorpions, mites, and ticks.
Insects have a different body plan and six legs, while spiders have eight. Spiders are part of the larger arthropod group, but they sit in their own clearly defined branch.
What A Group Of Spiders Is Called
People do not use a single everyday name for a group of spiders. You might hear a colony, a cluster, or simply a group of spiders, depending on the situation.
For social species, people may also mention communal webs or shared nests.
How Spiders Are Classified
Scientists classify spiders by ancient body lineages, then narrow them into families and species with different shapes, habits, and web styles. Some names point to early branches of the spider family tree, while others name familiar groups like jumpers, orb weavers, and widows.
Major Lineages: Mesothelae, Mygalomorphae, And Araneomorphae
Mesothelae represents the oldest living lineage, keeping a more primitive body form. Mygalomorphae includes tarantulas and trapdoor spiders.
Araneomorphae covers most of the spiders you see in daily life. These lineages help explain why spiders can look so different, even though they share the same basic plan.
Families And Well-Known Examples
Spider families include Liphistiidae, Araneidae, Salticidae, Theraphosidae, Agelenidae, Lycosidae, Theridiidae, Thomisidae, Sicariidae, and Archaeidae. Well-known examples are Nephila, Latrodectus, Parasteatoda tepidariorum, Argyrodes, and Maratus.
Families often share body shape, hunting style, or web type. For example, Salticidae includes jumping spiders, while Theridiidae includes many cobweb makers.
Why Common Names Vary By Region
Common names change from place to place, and the same spider may have several labels. A spider called a house spider in one region may have a more exact species name elsewhere.
Scientific names help provide a clear answer.
Types Readers Usually Mean
When you ask what spiders are called, you may really want the common types people mention most. These names usually describe how a spider lives, how it catches prey, or where you are likely to find it.
Web Builders Like Orb Weavers And Cellar Spiders
Orb weavers build classic round orb webs with strong spider silk. You may also hear orb-weaver spiders or orb web builders, since these terms often refer to the same web shape.
Cellar spiders are another common web-building group. Many other web-building spiders make tangled spider webs or messy cobwebs.
Their prey capture style depends on the web, not on speed.
Active Hunters Like Wolf Spiders And Jumping Spiders
Wolf spiders and jumping spiders actively hunt and do not rely on large webs for prey capture. A jumping spider uses sharp vision and quick moves.
You may also hear about peacock spiders, Portia, and Bagheera kiplingi as striking examples of hunters with unique courtship rituals or feeding habits. Some lynx spiders and net-casting spiders also hunt without using orb webs.
Burrowers And Heavy-Bodied Spiders Like Tarantulas And Trapdoor Spiders
Tarantulas are large, heavy-bodied spiders. Trapdoor spiders often live in burrows and wait for prey near the entrance.
People may also mention funnel-web spiders, grass spiders, and huntsman spiders as other grounded hunters. These spiders often use hiding, ambush, or silk-lined retreats instead of orb webs.
Medically Notable Names Such As Black Widow And Brown Recluse
Some names get attention because their venom can affect people. The best-known examples are black widow, redback spider, and brown recluse.
These spiders are not the most common ones you will see. Many spiders are harmless to people, but names like black widow and brown recluse often appear in safety advice and pest guides.
What Makes A Spider A Spider
A spider has a specific body plan, along with silk-making, prey-catching, and breathing features that set it apart from other arthropods. You can spot the main parts by looking at body shape, legs, mouthparts, and the way it moves or spins silk.
Two Main Body Regions And Key External Parts
A spider’s body has two main regions: the cephalothorax or prosoma, and the abdomen or opisthosoma. The two parts connect by the narrow pedicel.
Key external parts include the chelicerae and fangs, pedipalps, spinnerets, and many body hairs called setae. The legs have the coxa, trochanter, femur, patella, tibia, metatarsus, and tarsus, all supported by an exoskeleton.
Silk, Venom, And How They Feed
Spiders use spinnerets to make silk, and some species also have a cribellum for special silk production. Silk helps with webs, egg sacs, shelters, and travel.
Most spiders use venom and digestive enzymes for external digestion. They liquefy prey first, then drink it.
Senses, Breathing, And Circulation
Many spiders sense movement with body hairs and foot structures such as scopulae. Some spiders have a tapetum lucidum that helps with night vision.
Spiders breathe using book lungs or a tracheal system. They also use tracheae and spiracles.
Spiders have an open circulatory system with blood-like fluid containing hemocyanin. Their nervous system is often centralized, which helps them react quickly to prey and threats.
