1. Reptilia – “creepy crawly”
Examples: snakes, lizards, crocodiles, turtles

2. Traits
Dry, scaly skin

3. Traits
ectotherms

4. Traits
Well developed lungs

5. Traits
3 chambered heart with partially divided ventricle

6. Traits
Muscular bony legs to the sides, if any at all

7. Traits
Toes with claws

8. Traits
Internal fertilization

9. Traits
Lay amniotic eggs on land
Amphibian egg
Reptile egg

10. Reptilian heart
Good pressure, partially divided ventricle keeps blood from mixing as much

11. Reptilian adaptations for land life
To avoid dehydration – waterproof skin, colon absorbs water from feces, low respiration rate loses less water
Reproduction – internal fertilization, amniotic egg

12. Copulation
Process of internal fertilization, male inserts sperm into the female system

13. Amniotic egg
Overcame the last obstacle to life on land

14. Amnion provides a water environment for the developing embryo amnion

15. Albumen
Provides protein for building materials (white)
albumen
embryo

16. Yolk sac
Provides food energy
yolk sac
embryo

17. Shell and Chorion
Protects and waterproofs
embryo
shell
chorion

18. Allantois Collects wastes, acts as a respiratory surface allantoise
embryo

19. Orders of Reptiles
Squamata
Testudinata
Crocodilia
Rhynchocephalia

20. Squamata
Largest order of reptiles
E.g. – snakes and lizards

21. Testudinata
Turtles and tortoises
How do you tell them apart?

22. Turtles
live mostly in water, flatter shell, fast

23. Tortoises
live on land, rounded shell, slow

24. Turtle or Tortoise?

25. Turtle or Tortoise?

26. Crocodilia
Crocodiles and alligators

27. Alligators Crocodiles broad head rounded snout
teeth not as visible on bottom
Crocodiles
narrow head
pointed snout
teeth visible on top
and bottom

28. Alligator or Crocodile?

29. Alligator or Crocodile?

30. Alligator or Crocodile?

31. Alligator or Crocodile?

32. Rhynchocephalia Tuatara
3 rows of teeth (2 on top and 1 on bottom) and a light sensitive gland on its forehead that looks like a third eye