1. Class Reptilia

2. General Characteristics
Bilateral Symmetry
Scales
Respiration with lungs
Dioecious
Internal fertilization

3. Ectothermic
Cold Blooded
Regulate body temp with external environment
Amniotic eggs

4. Amniotic Egg – “a transferable pond”

5. The Incredible Edible Amniotic Egg!
Allows for reproduction on dry land!!
Protects embryo from dessication
Amnion (nutritious fluid) keeps egg from drying out
Contains a water and food supply for the developing embryo and can be laid on land.
Must be fertilized internally, has a shell

6. Amniotic Egg Cont.
Amnion : provides a watery environment for the embryo
Yolk: contains the food for the embryo
Allantois : connects the embryo to the yolk
Chorion : allows oxygen to enter and carbon dioxide to leave; gas exchange

7. Benefit of egg:
Animals are no longer dependent on water to reproduce

8. Reptilia
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order…

9. 3 Major Orders
Order Testudines
Order Squamata
Order Crocodilia

10. Order Testudines Turtles – sidenecks and “hidden neck” 225 species
Have bony shells called carapace that CANNOT be removed!!

11. Reproduction/aging
Sexual maturity at 7-8 years
Live 14+ years
Galapagos tortoises can live to be
100

12. Turtles vs. Tortoises
Tortoises are terrestrial
Tortoises lack webbing between feet

13. Order Squamata
Has 2 sub-orders
Sub-order Sauria
Sub-order Serpentes

14. Size: a few cm up to 3 meters long
Sub-Order Sauria
Lizards
3,300 species
2 Pairs of legs
Size: a few cm up to 3 meters long

15. Only 2 venomous lizards worldwide
Gila monster
Mexican Beaded (Monitor?)

16. Sub-Order Serpentes Venomous snakes have a pit organ
2300 species
Many produce venom
30 to 40,000 deaths per year
>100 in the US
Venomous snakes have a pit organ
Pit Organ: Heat-sensitive organ on the head of snakes used to locate small endothermic prey

17. Can have 200+ vertebrae

18. Order Crocodilia Crocodiles 21 species
Mostly unchanged in their 170 MY history
4 chambered heart
Caiman

19. Prey swallowed whole
May tear off pieces of too large prey by biting and rolling
Provide extensive parental care (NEW!!!!)