Loading presentation...

Present Remotely

Send the link below via email or IM


Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.



No description

Tyler Mayo

on 26 April 2010

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Arachnids

Arachnids What is an Arachnid? What is an Arachnid? Arachnids are carniverous Arthropods with the body divided into two main parts, the abdomen
and the cephalothorax. The arachnid has four sets of legs, which are attached to the cephalothorax. Arachnids also have two other sets of special appendages: the chelicerae and the pedipalps. Classes of Arachnids Spiders Scorpions Mites Harvestmen Ticks Spiders are the largest community of Arachnids. Spiders are found on every continent except for Antarctica. The abdomen of spiders have no appendages aside from spinneretes. These spinneretes create silk Scorpions are Arachnids with a pair of pincers and a barbed stinger on their tail. The "pincers" are actually the Scorpions pedipalps. Commonly known as "Daddy Long Legs", Harvestmen are known for having very long legs. The two main body segments, abdomen and cephalothorax seem to be formed into one circular shape. Unlike spiders, Harvestmen have no venom or silk glands. Ticks are external parasites that live by sucking the blood of thier host. They wait until contact with a possible host is made and they dig their mandibles into the skin and start feeding. Ticks can be found in many places around the world, especially heavily wooded and forest areas. Mites are parasites similar to ticks that can live off plants or animals. They go easily unnoticed due to the fact that many are microscopic. Physical Traits 8 Legs Chelicerae (fangs/mandibles) Pedipalps Two body segments Cephalothorax Abdomen and Exoskeleton Functions: Legs - Exoskeleton - Chelicerae - Abdomen - Pedipalps - Cephalothorax - Movement Feeding, reproduction, aid in movement Feeding doubles as a defense mechanism In spiders, contains the silk and venom glands Contains the head, legs are attached to the Cephalothorax Protection, contains the protein Chitin NO WINGS OR ANTENNEA! Feeding and Digestion Arachnids are mainly carniverous. They put digestive juices on their prey. The exception to this would be ticks and mites. The prey is quickly turned into liquid and is sucked up. Spiders will inject their prey with a venom that liquifies the insides. Which is sucked up later. All Arachnids with the exception of dust mites and a few harvestmen consume everything through liquid. The liquid slurry is sucked up through the mouth and into the esophagus. From there, it goes to the stomach where powerful enzymes absorb the nutrients. The leftovers are fed through the intestines and eventually excreted through the anus. Reproduction Arachnids are not hermaphrodites, there are males and females.
The male will give a females a spermatophore, which is like a package of sperm. The female will then lay eggs. Scorpions however, are a little different. The female can either have eggs that stay inside of them, or she can give birth similar to mammals. Nervous System and Senses The Arachnid nervous system consists of a brain and a chain of ganglia. Arachnids have two sets of eyes. One set (lateral) is good at picking up light and the other (median) is good at adding more destinction to an image. The lateral eyes are not sensitive enough to form a proper picture. Arachnids also have fine hairs on the exterior of the body that give it it's sense of touch. They also have elongated hairs similar to Setae, called Trichobothria. Respiration Arachnids can have two types of respiratory systems, book lungs or tracheae. Book lungs are found in pockets on the underside of the abdomen Tracheae are tubes that open at the exterior and are paired with spiracles. Circulation Arachnids have an open circulatory system with sinuses.
Full transcript