Distinguish between Insecta and Arachnida

Class Insecta :

  1. Body is divided into three parts : head, tho-rax and abdomen.
  2. Wings are found.
  3. Appendages on head are antennae, mandi-bles and maxiliae.
  4. The walking legs are three pairs.
    Class Arachnida :
  5. Body is divided into two parts: cephalotho¬rax and abdomen.
  6. Wings are lacking.
  7. Apendages on head are a pair of chelicerae and a pair of pedipalps.
  8. The walking legs are four pairs.