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• Phylum Arthropoda
  • Phylum Arthropoda (e.g. House Spider)
    • Subphylum Chelicerata (e.g. Horsheshoe crab)
    • Subphylum Trilobite (e.g. Trilobite)
    • Subphylum Uniramia
• Phylum Chordata
  • Phylum Chordata (e.g. Eel)
    • Subphylum Cephalochordata (e.g. Lancelet)
    • Subphylum Urochordata (e.g. Sea squirt)
    • Subphylum Vertebrata