Reptiles

By: Chris Kan &

Raymond Nguyen

Introduction

• Ectothermic vertebrates with lungs and scaly skin (waterproof).• Reptiles are divided into four orders: • Order Testudinata (Chelonia) - turtles and tortoises

Order Crocodilia - crocodiles and allies Order Rhynchocephalia - tuataras Order Squamata - snakes and lizards

• With over 8,163 different species, reptiles are found on every continent, except Antarctica.

• The skin, kidneys, and eggs are adapted to conserve water.

Crocodilians and Allies• Crocodiles have a • 4-chambered heart,

unlike most reptiles. • They have leathery armor

that serves as a protection.

• With muscular tails; strong webbed feet; and sharp toothed jaws; these reptiles are the ultimate predators in the water.

Tuataras

• Often called a “living fossil”.• Only can be found on the

islands of New Zealand.• It is the only survivor of a

large group of reptiles that roamed the dinosaurs over 250 million years ago.

• Unlike lizards, Tuataras don’t have ear openings, and they also have a single row in the lower jaw that fits between two rows of teeth in the upper jaw.

Snakes

• Over 3,000 different species. Measuring from a few inches to over 33 feet.

• Different snakes have evolved into different ways of living (locomotion, defense, obtaining food, etc.).

• Snakes are known for having a single elongated lung, and having no legs.

• All snakes are carnivores.

Lizards

• They are the largest group of living reptiles.

• With more than 4,000 species.

• From less than 18 mm. to over 10 ft. in size.

• Can survive in any conditions, except for extremely cold weather.

Turtles and Tortoises

• There are 293 different species.

• The only vertebrates that have a shell made of ribs fused with bones.

• Different shells differ to different needs.

• In some species, newborns may have the survival rate of 1 out of 50,000.

Difference with Amphibians

• Unlike reptiles, most amphibians need to have a water source at all times.

• Also, reptiles have scaly skins while amphibians have smooth and slippery skin.

• Unlike amphibians, reptiles can spend their entire lives on dry land.

• For amphibians, they spend their beginning lives in the water, spend adulthood on land, and come back to the water to reproduce.

• For aquatic reptiles, it is the complete opposite. The reptiles spend most of their lives in water, and come to land to reproduce.

Skeletal Structure of a Reptile

The End!!!!!