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ANGUIDAE
Ophisaurus
- Glass lizards
- Ear opening present
- A well defined fold along each side
- Neither forelimbs nor hindlimbs evident externally
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ANGUIDAE
Anniella
- Body covered by smooth cycloid sclaes not arragned in annuli as described above
- No ear opening
- No lateral fold
- No limbs
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ANGUIDAE
Elgaria
- Alligator lizard
- No median scale behind rostral
- nasals contact the rostral
- A granular fold along sides of the body
- dorsal and ventral scales large, overlapping
- Eyelids movable
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ANGUIDAE
Gerrhonotus
- A small median scale bordering rostral posteriorly
- Nasal separated from rostral by a lateral scale on each side
- A granular fold along sides of the bodydorsal and ventral scales large, overlapping
- Eyelids movable
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RHINEURIDAE
Rhineura
- Amphisbaenian
- Eye not discernable
- Body encircled by numerous earthworm-like rings
- No ear opening
- No lateral fold
- No limbs
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XANTUSIIDAE
Xantusia
- Night lizards
- Head covered with large, flat plates
- Ventral plates quadrangular
- 12 or 14 longitudinal rows of squarish scales on belly
- No eyelids
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GEKKONIDAE
Sphaerodactylus
- Dwarf Geckos
- Head covered with granular scales
- Ventral plates rounded
- A single round pad at tips of toes
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GEKKONIDAE
Coleonyx
- Gecko
- Lamellae on underside of digits without keels and not enlarged or expanded
- Digits on hindlimbs varying in length
- Small belly scales
- No granular fold
- No eyelids
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SCINCIDAE
Eumeces
- Supranasals present separating frontonasals from rostral
- Eyelids scaly
- Stripes
- Longer legs
- All scales smooth flat rounded equal in size
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SCINCIDAE
Scincella
- Ground Skinks
- No supranasals
- Frontonasal in contact with rostral
- Lower eyelid with a window
- No stripes
- Longer legs
- All scales smooth flat rounded equal in size
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SCINCIDAE
Neoseps
- Legs very short, with not over 2 digits
- Translucent window
- All scales smooth flat rounded equal in size
- No granular fold
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TEIIDAE
Cnemidophorus
- Whiptail
- Belly scales very large, quadrangular in 8 longitudinal series
- No granular fold
- Eyelids
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HELODERMATIDAE
Heloderma
- Gila Monsters
- Digits on hindlimbs of nearly equal length
- Belly scales quadrangular
- Beadlike granules
- Smaller belly scales
- Eyelids
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POLYCHROTIDAE
Anolis
- Anoles
- Ventral lamellae on next to last phalanx of digits expanded laterall, padlike
- No femoral pores
- Digits varying in length
- Belly scales smaller, pointed or rounded, not quandrangular
- No granular fold
- Eyelids
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PHRYNOSOMATIDAE
Phrynosoma
- Horned Lizards
- Head bearing bony spines posteriorly, or elevated somewhat in a projecting ridge
- No pads on lamellae
- Digits varying in length
- Belly scales smaller, pointed or rounded, not quandrangular
- No granular fold
- Eyelids
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PHRYNOSOMATIDAE
Cophosaurus
- Greater earless lizard
- Tail flat with broad black bands on ventral surface
- Two large black bars on side in front of hind legs
- No ear openening
- Sutures between supralabials diagonal, not vertical
- Median Postmental
- Normal head
- Not padlike lamellae
- Digits varying in length
- Belly scales smaller, pointed or rounded, not quandrangular
- No granular fold
- Eyelids
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PHRYNOSOMATIDAE
Holbrookia
- Lesser earless lizard
- Tail round with no black markings on ventral
- Two small black bars on one side
- No ear openening
- Sutures between supralabials diagonal, not vertical
- Median Postmental
- Normal head
- Not padlike lamellae
- Digits varying in length
- Belly scales smaller, pointed or rounded, not quandrangular
- No granular fold
- Eyelids
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PHRYNOSOMATIDAE
Uma
- Fringe toed lizard
- Interparietal subequal to or smaller than nasal opening
- A distinct ear opening
- Sutures between supralabials diagonal, not vertical
- Median Postmental
- Normal head
- Not padlike lamellae
- Digits varying in length
- Belly scales smaller, pointed or rounded, not quandrangular
- No granular fold
- Eyelids
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PHRYNOSOMATIDAE
Callisaurus
- Zebra Tailed lizard
- Interparietal much larger than nasal opening
- A distinct ear opening
- Sutures between supralabials diagonal, not vertical
- Median Postmental
- Normal head
- Not padlike lamellae
- Digits varying in length
- Belly scales smaller, pointed or rounded, not quandrangular
- No granular fold
- Eyelids
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PHRYNOSOMATIDAE
Sceloporous
- Spiny Lizards
- No transverse gular fold
- Middorsal row of scales no larger paravertebral scales
- Femoral pores
- Nasal separated from rostral
- Sutures between supralabials vertical
- Mental larger, no bordered by median postmental
- Superciliary scales strongly imbricate, large
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PHRYNOSOMATIDAE
Petrosaurus
- Rock lizards
- Dorsal Scales small granular, smorth
- enlarged supraoculars
- one or more blackish bars across shoulders
- Smaller in size
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PHRYNOSOMATIDAE
Urosaurus
- Tree lizards
- Dorsal body scales mostly granular, but some enlarged
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PHRYNOSOMATIDAE
Uta
- Side-blotched lizards
- Dorsal body scales uniform in size, gradually merging with laterals
- Often a rounded blue blotch behind axila
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IGUANIDAE
Dipsosaurus
- Desert Iguanas
- A single median dorsal longitudinal series of scales
- Transverse gular fold
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IGUANIDAE
Sauromalus
- Chuckwalla
- Supercilliary scales not imbricate but juxatoposed, like other scales on head
- Large fold
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CROTAPHYTIDAE
Crotaphytus
- Collared lizard
- Two scales bordering mental posteriorly
- Broad head
- Caudal scales smaller not pointed
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CROTAPHYTIDAE
Gambelia
- Leopard Lizard
- Three or more scales bordering mental posteriorly between infralabials
- Elongate head
- Small caudal scales, not pointed
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