Today, the Reptilia class is represented with 4 orders

(1)

(2)

Today, the Reptilia class is represented with 4 orders

(3)

Body is located in an oval shell

HEAD NECK TRUNK TAIL CARAPACE PLASTRON

(4)

HEAD HEAD NECK NECK TRUNK TRUNK TAIL TAIL Keratinezed nails Web between fingers

Keratinezed nails Web between fingers

Conical Teeth Conical

Teeth Eyes;

*On the side of head; *Mobile;

*Upper and lower eyelids * 3rd transparent eyelid under eyelids

Eyes;

*On the side of head; *Mobile;

*Upper and lower eyelids * 3rd transparent eyelid under eyelids

(5)

Round and long body

Round and long body _{Flattened body}_{Flattened body}

flattened as dorso-ventral body flattened as dorso-ventral body

LACERTILIA (LIZARD) LACERTILIA (LIZARD)

(6)

LEGS (EXTREMITIES) LEGS (EXTREMITIES)

SLENDER-LONG

SLENDER-LONG _{SHORT AND THICK}_{SHORT AND THICK}

WITHOUT EXTREMITIES

(7)

OPHIDIA (SNAKE) OPHIDIA (SNAKE)

SLENDER-LONG SLENDER-LONG

PELVIC GIRDLE REDUCED

HINDLEGS BECOME BLIND AND REMAIN UNDER SKIN PELVIC GIRDLE REDUCED

HINDLEGS BECOME BLIND AND REMAIN UNDER SKIN Boa

Snake Boa

Snake PhythonPhython

No eyelids

The eyes are covered with a transparent

layer of keratin. No eyelids

The eyes are covered with a transparent layer of keratin. No eardrum and opening No eardrum and opening

(8)

MORPHOLOGICAL DIFFERENCES BETWEEN THE SNAKE

AND LIZARDS

MORPHOLOGICAL DIFFERENCES BETWEEN THE SNAKE

AND LIZARDS

SNAKE LIZARD

Front legs None Usually Present Front legs gridles None Present

Hind legs Rarely (blunt) Usually Hindlegs gridles Rarely Present Sequence of single

ventral scales Usually None Mobile eyelids None Usually Ear opening None Usually Highly forked tongue Usually Rarely

(9)

Turtles shell

Dermal bones

(10)

(11)

(12)

(13)