arthropoda

• from Greek arthron ‘joint’ + pous, pod- ‘foot’.
• Paired, jointed appendages
• Bilateral symmetry; segmented body divided into functional groups called tagmata: head and trunk; head, thorax, and abdomen or cephalothorax and abdomen; definite head.
• Reduced coelom in adult
• Cuticular exoskeleton; containing protein, lipid, chitin, and often calcium carbonate secreted by underlying epidermis and shed (molted) at intervals; chitin occurs less pervasively in some other groups; exhibits ecdysis.
• Complete Digestive system
• Sexes usually separate, with paired reproductive organs and ducts; usually internal fertilization; oviparous, ovoviviparous, or viviparous; often with metamorphosis
• Class Arachnida

  
• Class Chilopoda

  House Centipede

  
• Class Insecta

  
• Phylum Arthropoda is a protostome