1. Class: Reptilia

2. What is a Reptile?
A cold-blooded vertebrate of a class that includes snakes, lizards, crocodiles, turtles, and tortoises. They are distinguished by having a dry scaly skin, and typically laying soft-shelled eggs on land

3. Testudines – Turtles and Tortoises
Hard Shell (usually)
Carapace and plastron
Oviparous
Internal fertilization
Often times lacking teeth

4. Alligator Snapping Turtle
Macrochelys temminckii

5. River Cooter
Hieroglyphic River Cooter
Pseudemys concinna

6. Red Eared Slider
Red Eared Slider
Trachemys scripta

7. Squamata – Snakes and Lizards
Largest order of reptiles (more than species)
Loosely hinged jaw
Skin is shed
May be limbless
Found all over the world!

8. Snakes
Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears
Paired organs are usually found one in front of the other
One functional lung

9. Snakes Smell the air with their forked tongue
Lack chewing teeth and must swallow prey whole
May or may not be venomous
How can we tell?!

10. Snakes and Venom (INDIANA)
4 nostrils (2 are pits)
“Fat” broad bodied
Broad “spade shaped” heads (triangle)
Slited pupils
2 nostrils
Head is about the same width as the body
Round pupils
Venomous
Non-Venomous

11. Eastern Hognosed Snake
Heterodon platirhinos

12. Cotton Mouth
Water Moccasin
Agkistrodon piscivorous

13. Queen Snake
Queen Snake
Regina septemvittata

14. Lizards
Lizards typically have feet and external ears, while snakes lack both of these characteristics. However, because they are defined negatively as excluding snakes, lizards have no unique distinguishing characteristic as a group.

15. Lizards Can have well developed color vision
Use a combination of body colorations, body positions and pheromones to communicate.

16. Eastern Fence Lizard
Eastern fence lizard
Sceloporus undulatus

17. 5 Lined Skink
Five lined skink
Eumeces fasciatus

18. Crocodilia Alligators, Crocodiles, Gharials, and Caiman
Closest relation to birds
“Belly walk” or more upright run for a period of time

19. Alligator Vs Crocodile

20. Alligator vs. Crocodile
Rounded U-shaped snout
Hidden teeth; except upper jaw teeth
Pointy V-shaped snout
Visible teeth that interlock
Alligator
Crocodile