Chondrichthyes vs Arthropod The black widow is most easily recognized by the hourglass marking on the underside of its abdomen. When bitten, a neurotoxin is released that can cause dull pain and cramping in muscles, that can be accompanied by sweating and vomiting. Less than 1% of black widow bites result in death. Black widow spiders are usually not aggressive. If disturbed, they will retreat to a corner of their web.
(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 ... ... middle of paper ... ...bush and attack their prey.
Therefore, the spiders that live in and around the houses are of many types. Most of them are web-building spiders. They can survive easily outside and inside the house. This article describes them a follows: a) Cobweb Spiders The cobweb spider normally has a body shape that resembles figure 8. You can also call it the comb-footed spider.
Finally, the genus of the South Black Widow spider is Latrodectus. This genus is famous for having spiders with a poisonous bite (Preston-Mafham 1984). Black Widow Spider http://pubs.ext.vt.edu/444/444-422/444-422.html Physiology (Muscles/skeletal/locomotion) The spider’s body is relatively simple. Similar to the rest of the species in Arthropoda, the spider has an exoskeleton that protects it from its environment. This exoskeleton protects the segmented sections of the body (the cephalothorax and the abdomen) as well as the four pairs of legs (Foelix 1996).
Most people associate the black widow as being venomous and deadly, and so they unfairly associate the same characteristics with harmless beneficial house and garden spiders as well. This attitude toward the spiders can also be applied to nature as a whole. Since humans posses this attitude towards nature, a lot of nature’s beauty is often overlooked.
Analysis of Scorpions Scorpions are of the class Arachnid. They are considered to be relatives of the spiders, mites, and ticks. There are about 1,300 species of scorpions in the world. Scorpions live in the deserts, but also they can occur in many other habitats, such as grasslands, savannas, forests, and caves. Also scorpions have been found in the Himalayas of Asia and Andes Mountains of South America.
Wolf spiders belong to Lycosidae family which means wolf. This spider has eight eyes and because of this, its vision is excellent, and it can easily communicate through the eyes. The other species may hunt their prey from the vibration sound, but this species is entirely different because it trails after seeing its prey. The eight eyes are arranged in 3 rows. The first row consists of 4 eyes; these eyes are small in size.
Spiders are grouped into this class as well as scorpions, ticks, mites, and many more organisms. The order, Araneae, is comprised of spiders. How do spiders and arachnids compare? While spiders and arachnids have many mutual traits, spiders differ in some key categories. All arachnids have similar anatomies, one of the most common traits being the number of appendages.
Adult black widow spiders have a shiny, black, rounded, circular abdomen and are about 1/3 inch long (about 1-1/2 inches when their legs are spread). Adult spiders have two reddish or yellowish triangles on their bottom which looks like an hourglass marking, and their body color is dark colored usually black or sometimes dark brown. They are usually recognized because of their red or red-orange hourglass design on the bottom of their abdomen. This pattern is changeable and may look like two separated spots. In some spiders there is no pattern on the abdomen.
Research Project: Class Insecta Insects are invertebrates in the class Insecta from the phylum arthopoda. Arthropods include more than 850,000 species and form by far the largest phylum in the animal kingdom, exceeding in number all the other Phyla combined. The characteristic tough exoskeleton and jointed limbs are superimposed in a segmental body plan that reflects the evolution of arthropods from ancestors of the annelid worm. Insects, arachnids, myriapods and crustaceans are the major groups in this phylum (Nichols). Insects are the largest of this phylum and make up the largest class of all organisms and are recognized by taxonomist to have nearly one million recognized species.