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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Deuterostomia (deuterostomes)
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Craniata (craniates)
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Euteleostomi (bony vertebrates)
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Tetrapoda (tetrapods)
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Amniota (amniotes)
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Order Squamata
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Family Acrochordidae
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Family Agamidae
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Family Amphisbaenia
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Family Amphisbaenidae
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Family Anguidae
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Family Aniliidae
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Family Anniellidae
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Family Anomalepidae
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Family Anomochilidae
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Family Atractaspididae
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Family Boidae
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Family Bolyeridae
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Family Chamaeleonidae
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Family Colubridae
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Family Cordylidae
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Family Corytophanidae
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Family Crotaphytidae
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Family Cylindrophiidae
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Family Dibamidae
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Family Elapidae
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Family Gekkonidae
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Family Gerrhosauridae
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Family Gymnophthalmidae
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Family Helodermatidae
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Family Hoplocercidae
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Family Hydrophiidae
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Family Iguanidae
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Family Lacertidae
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Family Lanthanotidae
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Family Leptotyphlopidae
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Family Loxocemidae
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Family Opluridae
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Family Phrynosomatidae
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Family Polychrotidae
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Family Pygopodidae
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Family Rhineuridae
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Family Scincidae
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Family Teiidae
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Family Tropidophiidae
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Family Tropiduridae
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Family Typhlopidae
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Family Uropeltidae
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Family Varanidae
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Family Viperidae
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Family Xantusiidae
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Family Xenopeltidae
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Family Xenosauridae
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