Arthropoda

• Arthropoda


  • Eukaryotic organisms
  • Heterotrophic
  • Bilateral symmetry
  • Cephalothorax- fused head and thorax
• Arthropoda body plan


  • Coelomate and triploblastic
• Arthropoda movement


  • Jointed appendages
• Chitin


  Exoskeleton is covered by thick hard chitinous cuticles
• Arthropoda respiratory organs


  • Gills
  • Tracheae
  • Book lungs
  • Spiracles
• Arthropoda circulatory system


  Hemolymph is pumped into cavities called hemocoels, bathing the internal organs directly
• Arthropoda nervous system


  • Ventral nerve cord coordinates neural signaling from the brain to the body
  • Segmental ganglia provides nerves to the appendages, dorsal muscles, sense organs, and heart
• Arthropoda excretory system


  Malpighian tubules remove nitrogenous waste products and maintain water and ion balance
• Arthropoda reproductive structures


  • Ovipositor is a tubular structure used for laying eggs
  • Cercus serve as pinching weapons or as organs of copulation
• Trilobitomorpha


  • All extinct marine organism
  • Bodies divided into three longitudinal lobes
  • One pair of antennae and biramous appendages
• Chelicerata - Merostomata


  • Aquatic organism
  • Book gills on opisthosoma
• Chelicerata - Arachnida


  • With book lungs, tracheae or both
  • Usually have four pairs of walking legs in adults
  • Example: house spider
• Chelicerata - Pycnogonida


  • Reduced abdomen
  • Four to six pairs of walking legs
  • Example: sea spider
• Crustacea - Remipedia


  • Cave-dwelling crustaceans
  • Approximately 30 segments that bear uniform biramous appendages
• Crustacea - Branchiopoda


  • Leaflike appendages
  • Example: fairy shrimp
• Crustacea - Malacostraca


  • Appendages possibly modified for crawling, feeding, swimming
  • Examples: lobster, crayfish, crabs, shrimp
• Crustacea - Maxillopoda


  • Five head
  • Thoracic segments variously fused with head
  • Example: barnacles
• Hexapoda - Insecta


  • Mouth appendages exposed and projecting mandibles
  • Well-developed Malpighian tubules
  • Example: mosquito
• Myriapoda - Chilopoda


  • One pair of legs per segment
  • Oval
  • Example: centipede
• Myriapoda - Diplopoda


  • Two pair of legs per segment
  • Round
  • Example: millipede
• complete metamorphosis

  • -          Egg, larva, pupa, and adult.
• incomplete metamorphosis

  • Egg, nymph (larva), adult.