Reptiles include turtles, lizards, snakes, tuatara, and crocodilians. They are cold-blooded with scale-covered skin and breathe through lungs. There are 5 orders of reptiles: Rhynchocephalia containing the tuatara; Chelonia containing turtles; Squamata containing lizards and snakes; and Crocodilia containing crocodiles and alligators. Reptiles range in size from 3 inches to over 30 feet and live on every continent except Antarctica.

1. Reptiles
By Mr. “Reptile Lover” Chapman

2. Reptiles
• Reptiles - living reptiles include turtles,
lizards, snakes, tuatara, and crocodilians
• All reptiles breathe through lungs, have
scale covered skin, and are cold blooded.

3. Classification
• Kingdom: Animalia
• Phylum: Chordata
• Class: Reptilia
• Order: 5 orders of reptiles

4. Reptile Orders:
• Order:
Rhynchocephalia
• Tuatara - 1 species
• Native to New
Zealand, an island
country off the
southeast coast of
Australia.

6. 4 Orders of Reptiles
• 1.Chelonia– turtles, tortoises

7. Turtles
• 250 species (all continents except Antarctica)
• Most primitive of all reptiles
• Range in size 3 inches to 6 feet
• All turtles lay eggs in nests they dig in the
ground
• No teeth, instead the edges of the jaws are hard
and sharp.

8. Order: Squamata
• This order includes:
• Suborder: Lacertilia (Lizards)
• Suborder: Serpentes (Snakes)

9. Squamata
• 3. Suborder: Lacertilia – Lizards

10. Lizards
• Lizards - ~ 3,500 species (all continents except Antarctica)
• Most species live in tropics.
• 3 inches to 10 feet. Largest species is Komodo Dragon
• Two species are venomous, one is the Gila Monster (SW U.S.)

11. Sepentes
• 2. Suborder: Serpentes – snakes

12. Snakes
• Snakes - ~ 3,500 species (all continents except
Antarctica)
• Most species live in tropics.
• 8 inches to 32 feet. Largest species is Reticulate Python
and Anaconda.
• Most primitive species still retain remnants of their hind
limbs from lizard ancestors, advanced species have no
limbs.

14. Crocodilia
• 4. Order: Crocodilia – crocodiles, alligators

15. Crocodilians
• Crocodilians - 21 species (No. and So. America,
Africa, Asia, and Australia)
• Most species live in tropics.
• 5 feet to 25 feet. Largest species is Nile
Crocodile
• All are aquatic

16. Characteristics
• All reptiles have a three chambered heart
with a septum.
• Greatly reduced metabolic rate so not
much heat is produced within the body
• Most reptiles found in tropical areas to
bask in the sun