19 
INFRAORDER SCOLECOPHIDIA -- Blindsnakes. 
Superfamily UROPELTOIDEA -- Slender Blindsnakes. 
Family Uropeltidae -- Shieldtail Snakes. 
Family Leptotyphlopidae -- Threadsnakes. 
Superfamily TYPHLOPOIDEA -- Typical Blindsnakes. 
Family Anomalepididae -- Primitive Blindsnakes. 
Family Typhlopidae -- Typical Blindsnakes. 
INFRAORDER CAENOPHIDIA -- Advanced Snakes. 
Superfamily ACROCHORDOIDEA -- Ancient Watersnakes. 
+Family Nigerophiidae -- Early Watersnakes 
([?Lower] Paleocene; Niger). 
Family Xenodermatidae -- Pebbled Swampsnakes. 
Family Homalopsiidae -- Rearfanged Watersnakes. 
Family Acrochordidae -- Asian Wartsnakes. 
Superfamily DIPSADIOIDEA -- Generalized Snakes. 
+Family Anomalophiidae -- Eocene Watersnake 
(Lower Eocene; Italy). 
+Family Russellophiidae -- Eocene Watersnake 
(Lower Eocene; France). 
Family Lamprophiidae -- Housesnakes & Allies 
Family Psammophiidae -- Sandsnakes. 
Family Xenodontidae -- Neotropical Snakes. 
Family Dipsadidae -- Middle American Snakes. 
Superfamily VIPEROIDEA -- Vipers & Allies. 
Family Viperidae -- Vipers. 
Family Crotalidae -- Pitvipers. 
Superfamily ELAPOIDEA -- Front-fanged Snakes. 
Family Elapidae -- Cobras & Allies. 
Family Hydrophiidae -- Seasnakes. 
Superfamily COLUBROIDEA -- Harmless Snakes. 
Family Colubridae -- Racers & Allies. 
Family Natricidae -- Modern Watersnakes. 
+ = Extinct taxon. 
@HGD-j1ly88 
