Arachnida Structure and Function

Arthropod Classification - copyright nabrown RVC

Deer tick - Wikimedia Commons

• Only two body divisions
  • Cephalo-thorax
  • Abdomen

• Three pairs of legs in the larval stages or four pairs of legs during the nymphal and adult stages

• No wings

• No antennae

• No compound eyes

• Small size
  • E.g. Ticks are under 1cm in length
  • E.g. Mites are under 1mm in length