Spiders Essay Example For Students

Spiders Essay SpidersMy essay is on spiders. I have chosen a few spiders to report about.Ialso have some basic info about spiders in general.Spiders comprise a large,widespread group of carnivorous arthropods. They have eight legs, can producesilk, and usually have poison glands associated with fangs. More than 30,000species of spiders are found on every continent except Antarctica in almostevery kind of terrestrial habitat and a few aquatic ones as well. Spiders rangein body size from about 0.5 mm (0.02 in) to 9 cm (3.5 in). The term spider isderived from the Old English spinnan ( to spin ) referring to the groups useof silk. Spiders make up the order Araneae in the class Arachnida, which takesits name from the mythological character Arachne, a peasant girl who challengedthe weaving skill of the goddess Athena. Arachne equaled Athenas skill in acontest, and in response to Athenas anger she hanged herself. In belatedremorse Athena changed the body of Arachne into a spider and allowed her toretain her weaving skill. We will write a custom essay on Spiders specifically for you for only $16.38 $13.9/page Order now My first selection is the brown recluse spider. The brown recluse spider(Loxosceles reclusa) is a poisonous spider in in the United States. Its mostlyfound from Kansas and Missouri, south to Texas, and west to California. Foundin sheltered places indoors and outdoors it is about 10 mm (.4 in.) long andhas an orange-yellow body with a dark violin-shaped design on its back. Itsbite isnt usually fatal to humans, the venom destroys the skin and it may takea few months to heal. The brown recluse is mostly active at night. it feeds onsmall insects that it paralyzes with its poison. The Black WidowThe black widow, Latrodectus mactans, is a poisonous spider of thefamily Theridiidae, order Araneida. The female, about 1.3 cm (0.5 in) long, isglossy black, densely clothed with microscopic hairs, and has a red hourglassmark on the underside of the abdomen. The male, which is rarely seen, is smaller than the female and has fourpairs of red marks along the sides of the abdomen. The black widow is foundworldwide in the warmer regions in every state in the United States exceptAlaska and Hawaii; it lives in a variety of natural and domestic habitats. Generally, the females are not aggressive unless agitated, although they areprone to bite when guarding an egg sac. The venomous bite of the black widowspider, Latrodectus mactans, causes muscle spasms and breathing difficulty inhumans and may be fatal. The female is distinguished by a red hourglass markingon its underside. The black widow eats a diet of insects, spiders and centipedescaptured in its web. After mating, the female may ensnare and feed upon hermatehence the name black widow. Its venomous bite causes muscle spasms anddifficulty in breathing. TarantulasIn common American usage, tarantulas are the large, hairy long-livedspiders that make up the family Theraphosidae. Related forms such as funnel-webspiders and trap door spiders are also often called tarantulas. The name camefrom a smaller wolf spider of Europe but was then applied by explorers of theNew World to the giant spiders that they encountered. No North American specieshas a venom that is dangerous to humans, but tarantula body hairs may induce anallergic reaction. Tarantulas can give you a painful bite. Tarantulas occur inwarmer regions, where they feed on both invertebrates and small vertebrates. Many grow to about 2.5 to 7.5 cm (1 to 3 in) long, with a 13-cm species (5-in)legspan, and some South American bird-catching species are larger. Sometarantulas reach an age of 20 years. SPIDERS Essay Example For Students SPIDERS Essay Michelle ReynoldsPopeScienceJanuary 06, 1999Outline TitleIntroduction:I.The first sub-topic A.Distinctive Characteristics1.Detail of the external anatomy2.Detail of the sensory organsB.Circulation and locomotion1.Detail of the circulitary system2.Detail of the respiratory systemII.The second sub-topicA.Digestion, Venom, and Spider Silk1.Detail of the digestive system2.Details of venom and spider silk Conclusion: Spiders are a very special unique and complexed ArachnidsMichelle ReynoldsMs. PopeScienceJanuary 06, 1999SPIDERSThe word spider came from an Old English verb spinnan.Spinnan means ?tospin.?People in Eroupe see spiders with distaste, in African and in American culturesspiders are respected. Spiders are the most abundant and distinctive of all earthly predators. Most of thetime they are not dangerous to us, spiders eat almost always insects and are found inplaces from the Tundras all the way to the low forrests They play abig job in taking careof the insect population, even the ones that can give us diseases. Distinctive CharacteristicsEven though insects and spiders belong to the group called, Arthopoda, they lookso different from each other so they are put into different classes. The Insects and theArachnids. Scientists think that these two classes split up thousands of years ago. We will write a custom essay on SPIDERS specifically for you for only $16.38 $13.9/page Order now External Anatomy Spiders come in different sizes, some of them are only 0.1 centimeter long,andsome of the are more than 4 inches long. They have two body parts and eight legs. Thespiders head and thorax are one body part. The thorax is the chest area of a spider. Theabdomen or the stomache is the second body part Each leg has seven sections, and onthe tips of many spiders legs are two tiny claws. Spiders that make a web use these clawsand their notched hairs, to walk on their webs without sticking to them. Like insects, spiders have a body shell called an exoskeleton. This shell covers thebody and the legs and keeps the spider from drying out. Much like our skin is to us. Andto support the spider like our bones support us. Spiders even have a skelton inside calledthe internal skeleton. This is where the muscles attach. Unlike insects, spiders dont have antennaes. They do have two things near theirmouths these are called pedipalps. They are used by spiders to handle their food. Thepalps of a baby male spider look like boxing gloves. When they grow up the palps areused for breeding. Sensory OrgansSpiders have eight eyes in two groups and some spiders can see images. Otherscant and they have to rely on feel like those on webs. Web weaving spiders eat, breed,and lay their eggs from silk threads. The main part of a spiders senses are two types of hair. The tiny ones have nerves. When these hairs are bent they send information to the brain and may cause it to runaway or get ready to attack. They also sense touch, vibration and air flow. The second type of hair are the even tinier one these keep an eye out for pressurechanges in the air. Curculation and LocomotionSpiders have an open circulatory system this means that they have no bloodvessels or arteries. Instead, the blood oozes between the spiders flesh, and collects inlittle pockets on the underside of the body. A good circulation is very important to the spiders legs. When spiders dont getenough water, their legs fold up and they cant move them. RespirationSpiders have different kind of respitory systems. Some have a tubular tracheae,some have book lungs, and others have both. They first spiders to live had one or twopairpairs of book lungs. The spiders now days have one pair of book lungs and a pair oftubular tracheae. .u63915ad437d7be3b99143f852d70a94b , .u63915ad437d7be3b99143f852d70a94b .postImageUrl , .u63915ad437d7be3b99143f852d70a94b .centered-text-area { min-height: 80px; position: relative; } .u63915ad437d7be3b99143f852d70a94b , .u63915ad437d7be3b99143f852d70a94b:hover , .u63915ad437d7be3b99143f852d70a94b:visited , .u63915ad437d7be3b99143f852d70a94b:active { border:0!important; } .u63915ad437d7be3b99143f852d70a94b .clearfix:after { content: ""; display: table; clear: both; } .u63915ad437d7be3b99143f852d70a94b { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u63915ad437d7be3b99143f852d70a94b:active , .u63915ad437d7be3b99143f852d70a94b:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u63915ad437d7be3b99143f852d70a94b .centered-text-area { width: 100%; position: relative ; } .u63915ad437d7be3b99143f852d70a94b .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u63915ad437d7be3b99143f852d70a94b .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u63915ad437d7be3b99143f852d70a94b .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u63915ad437d7be3b99143f852d70a94b:hover .ctaButton { background-color: #34495E!important; } .u63915ad437d7be3b99143f852d70a94b .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u63915ad437d7be3b99143f852d70a94b .u63915ad437d7be3b99143f852d70a94b-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u63915ad437d7be3b99143f852d70a94b:after { content: ""; display: block; clear: both; } READ: Artificial Intelligence Programming Assignment EssayDigestionSpiders are th only animal to digest their food on the out side of their bodies. Thegut of the spider is behind its stomach, and part of it goes into the front legs. This lets thespiders to live for days without eating. VenomAlmost all spiders have venom glands. Most spider venoms are not harmful to us,but the black black widow and the brown recluse spiders will poisen us. Spider SilkWhat makes a spider a spider? They can spin a web. All spiders, even baby ones,have silk glands and spinning organs called spinnerets. The silk glands push the web outand the spinnerets weave the web. Works CitedFirst reference. The Comptons Interactive Enclopedia CD ROM. Additional reference.The Discovery Channel On-Line on the internet.