Arachnids
4 pairs of legs on cephalothorax
pair of anterior appendages = chelicerae; glands produce toxins that are released through chelicerae to paralyze prey
pedipalps = 2nd pair of appendages; like legs but one segment less; copulatory organ in male spiders; not used for locomotion
External digestion: excretion of digestive enzymes into prey; suck up liquified prey
Order Araneae: Spiders Order Acari: Mites & Ticks
cephalothorax and abdomen mostly fused, unsegmented
predators of insects, small animals herbivores, carnivores, parasites