Chondrichthyes vs Arthropod :: essays papers

Chondrichthyes vs ArthropodThe dusky widow is intimately easily recognized by the hourglass marking on the underside of its abdomen. When bitten, a neurotoxin is released that tramp cause dull pain and cramping in muscles, that keep be accompanied by sweating and vomiting. Less than 1% of corrosive widow bites result in death.Black widow roamers are normally not aggressive. If disturbed, they will retreat to a corner of their web. These spiders are more than aggressive if they are protecting an egg sac. The natural habitat of a caustic widow is outdoors, under rocks, brush or piles of debris. Indoors, these spiders can usually be found behind furniture, in storage boxes, etcetera A black widows eyes are on top and adjoining the front of its head. They expect 8 eyes, arranged in 2 rows of 4 each. Some spiders have better vision than others. For example, hunting spiders have well eyesight at short distances. Their eyesight enables them to form images of their prey and ma te. Web-building spiders (the black widow) have poor eyesight. Their eyes are used for detecting changes in light. A black widows spill the beans opening is bellow its eyes. It does not have chewing mouth parts, and they eat only liquids. Various appendages around the mouth opening form a short straw through which the spider sucks the body fluid of its victim. The black widow can eat any(prenominal) of the solid tissue of its prey by predigesting it. To do this, the spider sprays digestive juices on the tissue. Chelicerae are a pair of appendages that the spider uses to seize and cleanup its prey. The chelicerae are above the mouth opening and just below the spiders eyes. from each one chelicera ends in a hard, hollow, ordered claw, and these claws are the spiders fangs. An opening in the tip of the fang connects with the embitter glands. When the black widow stabs an insect with its chelicerae, poison flows into the wound and paralyzes or kills the victim. The fangs of tara ntulas point straight down from the head, and the poison glands are in the chelicerae. In the black widow, the fangs point crosswise, and the poison glands extend back into the cephalothorax. They also crush thier prey with their chelicerae. Pedipalpi are a pair of appendages that look like dinky legs. One pedipalp is attached to each side of the spiders mouth, and they form the sides of the mouth.