Arachnids Section 30.2.

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Presentation transcript:

Arachnids Section 30.2

Features of Arachnids Spiders, scorpions, ticks, mites, daddy longlegs Cephalothorax and abdomen No antennae 1st pair of appendages are chelicerae – modified into pincers or fangs 2nd pair of appendages are pedipalps – modified to catch and handle prey No jaws  inject prey with poison to liquefy it

Spider fangs

Some arachnids have pincers

Spiders Chelicerae modified into fangs Poison glands secret toxin through the fangs that paralyzes or kills the prey Only two U.S. spiders are dangerous: black widow and brown recluse Strands of silk are produced in the spinnerets in the abdomen

Black Widow spider

Brown Recluse Spider

Brown Recluse Spider bite

Webs are made from silk produced in spinnerets

Computer enhanced photo of spider spinnerets

Scorpions and Mites Scorpions – stinger on the end of the abdomen Pedipalps are pincers Mites – largest group of arachnids Head, thorax and abdomen are fused into unsegmented body Some are plant or animal parasites (ticks)

Scorpion

House dust mite

Deer ticks – can carry Lyme disease

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