Arthropods_Part_2 - Class Arachnida Largest of three...

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Class Arachnida • Largest of three classes – have a pair of chelicerae: anterior appendages – a pair of pedipalps: resembles legs (not used for locomotion), copulation or pincers – four pairs of walking legs – most are carnivorous, except for mites – many spiders have book lungs( leaf-like respiratory organs
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Class Arachnida • Order Araneae: spiders – about 35,000 named species of spiders – Most are predators of insects • Some form silk webs force out by the spinnerets (in the abdomen) • many do not spin webs, but actively hunt (tarantula) • have poison glands leading through their chelicerae – used to bite and paralyze prey
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Class Arachnida • Order Acari: mites and ticks – largest in terms of number of species and most diverse of arachnids • about 30,000 named species • diverse in structure and habitat –found in virtually every habitat known • ticks can carry many diseases –Blood eating parasites –Carry diseases (viruses, bacteria and protozoa)
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Fall '08 term at Wayne State University.

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Arthropods_Part_2 - Class Arachnida Largest of three...

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