In order to hunt and evade predators, spiders need to be able to sense movement all around them. NPS photo by Sarah Zenner. I sincerely hope nothing like that exists. Any reference on spiders will have a description of the anatomy, but try: Barnes, R. D. 1987. 3 0. krypto'nstreaky. Moved. As of 2019, approximately 120 families and more than 48,200 species of spiders have been identified. Jumping spiders, a group of spiders that actively hunts its prey rather than trapping it in webs, have four pairs of eyes (as do most spiders). Relevance. Spider’s legs are covered with many hairs. Question Date: 2017-09-11: Answer 1: Why do spiders have eight legs? Over the years, more spider species with no eyes have been discovered in different parts and caves of the world. 1 decade ago. Spiders are arthropods that belong to the class Arachnida, which is composed of joint-legged invertebrates that include spiders, scorpions, ticks, mites, solifuges, and harvestmen.They are all characterized by having eight legs. In some species, the front two legs have taken on sensory functions. The unsegmented abdomen attaches to the cephalothorax by means of a narrow pedicel, giving the spider the … These spiders will use their main eyes for basic vision (with sharp, colored vision that allows them to see ultraviolet light that humans cannot see). You will also see that it has two more structures like short legs, one on either side of the head; they are called pedipalps. 3. In the male the tips of these structures are swollen and he will fill these with semen before setting out to find a female. Insects have only six legs. J. JackHomer Senior member. Telemidae, Cicurina, and Kauaʻi cave wolf spider are all examples of eyeless spiders. Insects only have 6 walking legs, but they have 2 specialized information-detecting legs that we call antennae. From the innocent daddy longlegs to the harmful brown recluse, here are the most common house spiders, how to identify them, and when to worry about a bite, according to entomologists. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Step 1 : Introduction to the question "8. At the end of the legs are, at least, two small claws. Many different species of spiders, especially jumping spiders, have four sets of eyes. Their Bodies Have Two Parts . A spider has 8 legs. 1 0. Hunting spiders that have very good eyesight, during the day, include wolf spiders, jumping spiders, bolas spiders, and net-casting spiders. Occasionally they loose a leg or more, but they all start out with eight legs. If you find these leg characteristics similar to your spider then look into its eyes, all six of them. They are found in all continents except Antarctica, and have established permanent colonies in every habitat except sea and air. 1 Questions & Answers Place. Each leg has claws at the tip—web-spinning spiders have three, all others have two—with thousands of small, flexible hairs covering them. 8-legged spiders and 2-legged people survived and reproduced. Scientists may have uncovered why spiders are so creepy-crawly—they have more legs than they actually need, a new study says. That's like asking why spiders have eight legs when insects do just fine with six. Does having 8 eyes lend them an advantage over other animals? Arachnids. All spiders, from tarantulas to jumping spiders, share this common trait. We all know that insects tend to have six legs and that spiders have eight. That's just how they evolved to fill their respective niches. Most spiders use a web to catch their prey, which is usually insects. Answer Save. The problem is that not just spiders have eight legs but other arachnids too! login or register to post comments. There are about 40,000 known species of spiders. Invertebrate Zoology, 5th ed. In a word- yes! Whereas legs and pedipalps (feelers analogous to insect antennae) still have several jointed segments, spider chelicerae are reduced to two portions, the basal block and the jack-knife fangs. Alain Pasquet and colleagues noticed that more than 1 in 10 spiders caught in the wild are missing one of their eight legs, so they decided to see whether spiders with fewer limbs suffer any disadvantage when it comes to spinning webs: Based on the findings, the authors propose that spiders have legs that they don't really … Do Spiders Have 8 Legs or 6? No. Spiders are arthropods that have eight legs. 1 decade ago. Spiders, scorpions, mites, ticks, whip scorpions, and pseudoscorpions are all … Spiders have 48 knees. They do not have antennae; the pair of appendages in front of the legs are the pedipalps (or just palps). Same with eyes; some arthropods have fewer than others; some have simple eyes, some have complicated (like "higher-animal") eyes (the large main eyes of Jumping spiders are really marvelous! What Are Spiders. "...1. 3 2. 4 4. 1 decade ago. Spiders have eight legs with seven segments: the coxa, trochanter, femur, patella, tibia, metatarsus and at the end, the tarsus. level 2. Subject: Do all spiders have eight legs? That would be slightly terrifying. Eyes or no eyes, all spiders must have a different way of observing the world. A spider needs so many eyes because it cannot twist its cephalothorax ("head") to see. Spiders are arthropods from the class Arachnida that have 8 legs and fangs that can often inject venom. The upshot to having a multi jointed exoskeleton is that spiders don't have … Why do spiders have 6-8 legs? Saunders College Pub., Philadelphia. The appendage of a spider is whatever the spider wants it to be. Like all spiders, this golden silk orb weaver, photographed in Shark Valley, is an arachnid and has eight legs. They need these extra sets of eyes, as they do not easily catch their prey in webs — they hunt! 8 legs, 6 legs, lots of legs, some legs that have become antennae or claws or mating palps in males. They have a … : When it comes to spiders, one of the characteristics that set them apart is the number of legs they have. Yup, count them…eight legs with six joints on each. Why do spiders have eight legs? Same goes for spiders BORN with less than 8. they are usually crippled and wont live ling if born with more or less legs. Spiders typically have eight walking legs (insects have six). Date: Fri Jun 23 03:05:20 2000 Posted by ERIK KEENE Grade level: 4-6 School: American Hertiage Christian School City: Hayward State/Province: Ca Country: United States Area of science: Zoology ID: 961743920.Zo One color: Some spiders have multi-colored legs, but loxosceles keeps it solid—no stripes and no patterns. Spiders do not have a skeleton inside their bodies. They have more legs and different body parts than insects, and they also don’t move around in the same way insects do. If your spider doesn't have these legs then it's definitely not a brown recluse. Find answers now! Why do we have 2 legs? Rather, the eyes are fixed in place. Humans only have one major joint per limb (knee, elbow, etc), but spiders have seven joints for each leg. This means that spiders are not classified as insects. All spiders (except those in the obscure family Uloboridae) inject venom through the hollow fangs to kill their prey, which includes enzymes that start to liquidise the food. 5 years ago. Spiders don't have specialized antennae, but they have various information-gathering devices on their various legs, such as special vibration-detecting hairs and (if I remember correctly) scent detectors. Why do spiders have so many legs (besides giving us the creeps)? One of the identifying features of all spider arachnoids is that they have 8 legs and no antennae. 1 3. Spiders (order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. 12 Answers. All spider species are called arachnids because they belong to the class of animals called Arachnida. The simple eyes, fangs, palps, and legs are all found on the anterior body region, called the cephalothorax.The spinnerets reside on the posterior region, called the abdomen. How many pairs of legs do all spiders have? They have 8 legs and 2 mouth pieces that look like legs. Dec 20, 2002 235 0 0. 2 Spiders have eight legs. Starting from the body end, these are the coxa, … Why Spiders Have So Many Eyes . In some species, the pedipalps are large enough to resemble legs but are entirely different appendages. The hairs pick up vibrations and smells from the air. Here's one answer: Our ancestors - and the spiders' ancestors - with different numbers of legs didn't live and reproduce. ), some have compound eyes (think dragonflies). No, but they have 8 legs. This large group of leggy animals also includes mites, ticks, and scorpions. Anonymous. Spiders are in the arachnid class, but not all arachnids are spiders. What are spiders? Do spiders have legs 8 feet long? Anonymous. if a spider has more (which is unlikely) then you can call it a genetically misshapen spider. Legs. Spider anatomy Spiders have the following basic features: Two body parts; cephalothorax and abdomen Eight legs Pedipalps (the feelers) Spinnerets (silk spinning organs) Eyes (6 or 8) Chelicerae (mouthparts) Fangs (connected to the chelicerae) Click on the diagram BELOW to see these features There are around 4000 species of spiders … Jun 19, 2004 #17 Originally posted by: apac "Hey Richard your car is getting towed" Spiders don't have this same movement. The spider’s four pairs of legs are attached to the prosoma. Contributed by MaggieP on 14 May, 2014 - 6:28pm Last updated 19 May, 2014 - 12:12pm. A spider's legs has 7 joints (Photo: Eky.edu). some indeed use two of their legs as antenna but they are in fact legs. Favourite answer. Spiders' legs are made up of seven segments.