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