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Class Reptilia
BIO 2215
Oklahoma City Community College
Dennis Anderson
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Class Reptilia
• Scales• Amniotic egg• One occipital condyle• Ectothermic• Three chambered
heart– Alligators have 4
• Claws
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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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Oklahoma Snakes
Poisonous
Nonpoisonous
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Copperhead Agkistrodon
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Cottonmouth or Water Moccasin Agkistrodon
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Western 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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Order Crocodilia
• Crocodiles• Caimans• Alligators• Gavials• Elongated skull• Four chambered
heart
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Caiman
• Elevated eyes
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Alligator
Crocodile
Caiman
Gavial