KINGDOM ANIMALIA

• Arthropods (phylum Arthropoda) are named for their jointed appendages.
• Subphylum Trilobita

  • All extinct forms from Cambrian to Carboniferous
• Subphylum Chelicerata

  Includes Horseshoe crabs, spiders, mites
• Class Merostomata

  Horseshoe Crabs
• Class Pycnogonida

  Sea Spiders

  Have four or more pairs of legs
• Class Arachnida

  • Arachnid. Live on land
• Subphylum Crustacea

  • Crustaceans:
  • Are nearly all aquatic