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Class Reptilia

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Class Reptilia

• Scales• Amniotic egg• One occipital condyle• Ectothermic• Three chambered

heart– Alligators have 4

• Claws

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Amniotic Egg

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Ectothermic

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Reptile Skulls

• Anapsid– No opening

• Synapsid– One opening

• Diapsid– Two openings

• Euryapsid– One small opening

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Anapsids

• Turtles

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Diapsids

• Dinosaurs• Snakes• Lizards• Crocodilians• Birds

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Dinosaurs

Dominate animals in Mesozoic Era

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Euryapsid

• Extinct• Ichythyosaurs

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Synapsids

• Pelycosaurs• Dimetrodon

– Mammal like reptile

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Order Testudines

• No teeth in adult• Shell• Anapsid

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Turtle Shell

Carapace

Plastron

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Box TurtleTerrapene

• Adapted to live on land– Feet not webbed– High domed shell– Safe

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Red-Eared SliderTrachemys

• Red stripe behind eye• Live in or near water

– Ponds– Slow moving water

• Pets• Carry Salmonella

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Snapping TurtleChelydra

• Live in water• Lay eggs on land• Long tail• Muscular limbs

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Giant TortoiseLifespan 150 Years

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Leatherback Sea Turtle

• 6 feet long• 1,400 pounds

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Order Squamata

• Kinetic skull– Movable joints

• Lizards• Snakes• Dinosaurs

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Geckos

• Small lizards• Adhesive toe pads

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Gecko Toe Pads

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Wall LizardLacerta

• Color is variable• Slender body• Small scales

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Texas Horned Lizard• Spines for protection• Eats ants• Endangered species

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Gila Monster

• Poisonous lizard• Not very aggressive

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Green Iguana

• Ornamental crest• Five feet long• Tropical rainforest

– Mexico– South America

• Omnivores

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Chameleons

• Arboreal• Africa and

Madagascar• Catch insects with

tongue

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Komodo Dragon

• Attack and eat humans

• 10 feet long• 300 pounds• Indonesia

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Snakes

• No legs• No external ears• Jacobson’s organ

– Sense smell with aid of tongue

• Cornea of eye protected with a spectacle– transparent membrane

• Skull bones loose – Swallow large prey

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Swallow Prey

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Snake Venom

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Alabama Snakes

Poisonous

Nonpoisonous

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Copperhead Agkistrodon

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Cottonmouth or Water Moccasin Agkistrodon

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Eastern Diamond Backed RattlesnakeCrotalus

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Prairie Rattlesnake Crotalus

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Timber Rattlesnake Crotalus

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Black Rat Snake

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Diamond Backed WatersnakeNerodia

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Green Snake

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Coral Snake

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Order Crocodilia

• Crocodiles• Caimans• Alligators• Gavials• Elongated skull• Four chambered

heart

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Alligator

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Caiman

• Elevated eyes

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Gavial

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Alligator

Crocodile

Caiman

Gavial

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The End