Spiders
Spiders can be found in all environments throughout the entire world, except in the air and sea. (Biology of Spiders, R.Foelix) These invertebrates of the order Aranea are one of the several groups of the Class Arachnida, with about thirty four thousand species.
They range in body size from only a few millimeters in length to almost five inches.
All are carniverous and have four pair of walking legs, one pair of pedipalps, and one pair of chelicerae. (Spiders, W.Shear) Each chelicerae consists of a base and a fang.
The fang folds up inside of a groove in the base until needed when attacking food, then moves out to bite and releases venom from a tiny opening at its end as it penetrates
the prey. (Biology Of Spiders, R.Foelix) They are also used to “chew”, getting digestive juices inside the body of the prey then squeezing out the liquid lunch. The pedipalps are mainly used to catch and rotate the prey while the chelicerae inject it with poison to tear down the tissue.
Later the bases of the pedipalps are used as chewing parts. (The Spider Book,J.Comstock) But in males, these palps are used to transfer sperm into the female. These twleve appendages are attached to a dorsal and a ventral plate, the carapace and sternum which cover the entire prosoma and provide attachment points.
The bodies of spiders consist of two parts, an anterior part called the prosoma and a posterior portion called the opisthsoma. These two portions are held together by a narrow stalk called the pedicel.
This narrow junction allows for the spider to be very limber and acts somewhat as a hinge between the prosoma and opisthosoma. So as a spider moves foward creating a web, it can continue in a straight line throwing its webbing in the direction it chooses.
This is how spiders create their zig-zag web formations. (Biology of Spiders, R.Foelix)
Covering both the prosoma and the opisthosoma is a waxy covering that enables the spider to be a very efficient water conserver. This is one of the characteristics that spiders evolved to adapt to the harsh conditions of terrestrial life. There are eight eyes located in the head region usually in two rows, varying among families. Spiders that
wait for and lunge at its prey will have a row of very large eyes well adapted at detecting the precise distance it is from its prey. Yet those spiders that make webs do ...
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...bush and attack their prey. They too have a large set of eyes on their upper posterior row, above a row of four generally small eyes. Although wolf spiders have well developed eyes, they react mainly to vibrations recieved from beating wings or movement from
insects on the ground. As with the jumping spiders, there are a large pair of fangs that extend down to help assist in seizing prey. The most well known wolf spider is the tarantula. These spiders can reach up to ten inches in their complete lengths. And although lore has it that they are one of the most poisonous spiders, their bites are only painful to humans, not deadly. (Biology of Spiders, R.Foelix)
Though feeding habits vary with spiders their methods of reproduction are all relatively similar, though each species has its own specific ritual. Because spiders are cannabilistic, the much smaller male must be very cautious in approaching a potential mate. If he simply rushes in towards the female, the chances are that he will be seen only as food and consumed. So spider courtship has evolved into a special complex pattern that varies in each species. This variation allows for species recognition, so no gametes are was
This story is about a hungry spider that wanted to eat at all the feasts in different villages. For the spider to be able to do this he left ropes at each village and when there is a feast, the villagers are instructed to pull the rope. The unexpected thing that the spider did not know was going to happen was that every village food was ready at the same time, and the spider had the rope tied around his waist. Due to the villages food ready at the same time the spider was pulled in all directions and was not able to eat any of the food. The novel’s purpose of this fable is to tell a story of why do spiders have small waist, but it is also supposed to show the both Ishmael and the audience that live is unpredictable even when things are
In the phylum Mollusca, there are many organisms that have body parts that change as the environment around them change; such as the octopus. An octopus can camouflage to variety of objects in its environment. Each organism in the Mollusca phylum has a type of foot that stows mobility and they eat by a radula. The radula is strap like tongue that has very sharp teeth and they can change to be different shapes or sizes based on their prey. They have a pseudo coelomate body plan, meaning that they have a coelom that exists, but it is lined by mesoderm only on the body wall, not around the gut. This video enhanced my understanding standing of the phylum Mollu...
Isolation continues throughout the story and begins to be more prominent. For example, the driver from the hit and run, who leaves the scene, is never mentioned again throughout the story. From this Ann and Howard have a limited perception that they can never really get rid of. Also, another example that influences the theme is when the men on the elevator are speaking another language. This gave me a sense that the author was trying to suggest that we as humans cannot understand each other. With that being said Ann feels this separation when she meets fr...
…the world is like an enormous spider web and if you touch it, however lightly, at any point the vibration ripples to the remotest perimeter and the drowsy spider feels the tingle and is drowsy no more but springs out to fling the gossamer coils about you who have touched the web and then inject the black, numbing poison under your hide.(188-89)
two pleural lobes on the sides. The three main parts of it's body are called the
Fox, R. 2001. Invertebrate Anatomy OnLine: Artemia Franciscana. Lander University. http://webs.lander.edu/rsfox/invertebrates/artemia.html, retrieved February 13, 2011.
Theodore Roethke’s short poem “My Papa’s Waltz” can be interpreted as a brief representation of alcohol abuse by the father. The poem is short and brief and does not go into full depth as to what creates the idea of how the father could be represented as an alcoholic. However, the poem’s diction, style, and imagery helps create a sense of unspoken words that the poet is trying to portray. Diction, style, and imagery in poetry help enhance the poet’s narration of his poem. These literary devices also help create a sense of understanding for the reader so they are able to interpret the poem from different perspectives.
... in the form of poor and humble people". Arachne had already done enough damage by openly saying that her skills were equal to or possibly even better than a goddess's, but to continue to insult Athena by weaving such a pattern in to her cloth was taking it too far. In the end Athena turns Arachne into a spider and dooms her and her descendants to continue to weave.
...er and the soul are alike in how they search for what will continue their existence. For the spider, it is waiting patiently as he tries to find a way to trap his prey in order to continue its life. As for the soul, it must be patient and hold on to what it knows as religious truth as it waits to be nourished by the one that it truly serves. Both the spider and the soul must hold onto their anchor in order to wait for their prey. Once it is spotted, they must move quickly to it in order to ensure that they catch it. Once it is within their grasp, their existence may continue. But, if they are sidetracked by what goes on in their immediate surroundings instead of concentrating on their prey, then they may lose their opportunity for life. That is why the spider and the soul must be patient, noiseless, and ever ready to obtain what they have hunted for so long.
parts to it; the choroids, ciliary body, and the iris. The choroids is what provides
The tarantella has a very interesting history. Its name derives from a little southern town of Italy called Taranto. It was believed that if a spider called the tarantula bit the townspeople, the only way to survive its bite was to do a dance called the Tarantella. The locals believed this was the only cure. If the people bitten did not dance they would suffer severe pain, muscle spasms, vomiting; most eventually died.
The eye is an extremely diverse organ, ranging in complexity across and within animal phyla. Here, a comparative approach is taken to outlining the diversity of the eye forms within vertebrates and invertebrates. The eye morphology of a variety of organisms was examined. Eye function, and placement on the body was also considered. Here, variation in eye form is discussed in relation to the environment the organism is adapted to. It is shown that an organisms eye morphology functions optimally for the ecological niche it occupies. Evolutionary analysis is used to account for the emergence of the different eyes. Convergent evolution is used to justify the similarities in eye types seen in organisms of different species. This analysis begins with the simplest of eye forms composes of single cells, present in the zooplankton larvae. Such primitive forms are identified in mollucs, annelids, cnidarians, and are then compared to more advanced eye forms contain lenses. This comparative approach provides a breadth of examples of vertebrates and invertebrates, making visible, the diversity of eye morphology within the animal kingdom.
Arachnida is a subphylum of Arthropoda, consisting of over 100 000 species, many of them being parasites which can carry disease. They are found in all environments, and mostly have eight legs, which is a feature, together with the fact that they do not have wings or antennae, often used to distinguish them from the other subphyla, though there are exceptions. They include spiders, scorpions, ticks and mites. Their bodies are divided up into three parts: the cephalothorax, the opisthosoma and the thorax, and use a type of lung for gas exchange. Most Arachnids are carnivorous, and eat pre-digested insects and other small animals. They reproduce using internal reproduction usually lay eggs, except for the scorpion which bears living young. The word ‘Arachnid’ comes from the Greek word ‘Arachne’ meaning ‘spider’.