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Tiffany Cooper

on 23 April 2010

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Transcript of ARACHNIDS

THANK YOU FOR WATCHING OUR PRESENTATION!! There are a few spiders that adapted to freshwater life by trapping air bubbles underwater and carrying the bubbles with them. A female water spider of the family Argyronetidae tends its egg cocoon while underwater in a freshwater pond. Water spiders use silk to house their eggs while underwater. They are classified in the subphylum Chelicerata. They named for the mythological figure Arachne. They feed on the pre-digested body of insects and other small animals. ARACHNIDS They're usually predaceous. Many of them are venomous. They secrete poison from specialized glands to kill prey or enemies. They are divided into 11 orders
The Acari or Acarina (mites and ticks) Amblypygi (tailless whipscorpions) Araneae (spiders) Opiliones (daddy longlegs) Palpigradi (palpigrades) Pseudoscorpiones (false scorpions) Ricinulei (ricinuleids) Schizomida (micro whipscorpions) Scorpionida (true scorpions) Solpugida (windscorpions) Uropygi (whipscorpions) They often hunt or lie in wait for small animals such as insects to come by them. There food may be partly or wholly broken down by secreted fluids and then sucked in. Most arachnids are harmless and can contribute to the balance of nature by controlling the populations of the insects they prey on or the plants, reptiles, birds, or mammals that serve as their hosts. The bites of some spiders and the stings of a few species of scorpions are dangerously poisonous to humans. Scorpions are the oldest arachnids for fossils are known. They also were the first arachnid fossils to be found in Paleozoic strata. But they often feed on other species of mites. Ticks carry organisms that cause serious human diseases, such as Lyme Disease. Ticks are a distinct bloodsucking subgroup of mites specialized for parasitizing reptiles, birds, and mammals. Mites considered the largest and most diverse order.

http://animal.discovery.com/videos/way-of-the-warrior-the-widow-warrior.html Tailless Whipscorpions are neither true scorpions nor true spiders. Ricinulei are small animals that live in high humidity microhabitats such as leaf litter. One of Ricinulei most unusual characteristics is a hood-like structure that commonly covers the anterior of the cephalothorax (thus covering the mouth and chelicerae). They live in humid tropical and subtropical habitats, hiding under leaf litter and debris by day and emerging to hunt at night A few species dwell in caves but some species are common in houses.
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