(Order Squamata, Suborder Lacertilia)

Family Anguidae - Glass Lizards (lizards with lateral folds; tails extremely brittle; in OK, legless)

Western Slender
Glass Lizard

Ophisaurus attenuatus

Family Scincidae - Skinks (lizards with smooth, shiny scales; tails extremely fragile)
Five-lined Skink
Eumeces (Plestiodon) fasciatus
Southern Prairie Skink
Eumeces (Plestiodon) obtusirostris

Family Phrynosomatidae - Spiny lizards (lizards with rough, spiny scales)
Texas Horned Lizard
Phrynosoma cornutum
Fence Lizard
Sceloporus undulatus

Family Crotaphytidae - Collared lizards (lizards with enlarged hind legs for running and jumping, and long tails for balance)
Eastern Collared Lizard
Crotaphytus collaris