28 . Family Phrynosomatidae 29 . Family Polychrotidae 30 . Infraorder Scincomorpha 31 . Family Scincidae 32 . Family Gymnophthalmidae 33 . Family Teiidae 34 . Family Xantusiidae 35 . Snakes 36 . Family Anomalepididae 37 . Family Leptotyphlopidae 38 . Family Typhlopidae 39 . Family Boidae 40 . Family Loxocemidae 41 . Family Ungaliophiidae 42 . Family Colubridae 43 . Family Dipsadidae 44 . Family Natricidae 45 . Family Elapidae 46 . Family Viperidae 47 . Glossary 48 . Bibliography 49 . Photo Credits 50 . Index
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