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iii) Reptiles -Dinosaurs

iii) Reptiles -Dinosaurs. By: Camila Rodriguez. Dinosaurs. Not the first reptile Triassic period Cretaceous period Diapsid skull. Reason for the name. # of species currently existing. From the Latin word ' reptilis ' Means ' creeping’. 9,475 species

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iii) Reptiles -Dinosaurs

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  1. iii) Reptiles-Dinosaurs By: Camila Rodriguez

  2. Dinosaurs • Not the first reptile • Triassic period • Cretaceous period • Diapsid skull

  3. Reason for the name # of species currently existing • From the Latin word 'reptilis' • Means 'creeping’ • 9,475 species • Divided in 4 groups: Crocodilia, Squamata, Testudines and Sphenodontia. • Crocodilia: alligators, crocodiles, caimans and gharials. • Squamata: Snakes and Lizards • Testudines: tortoises and turtles • Sphenodontia: tuataras

  4. Squamata Crocodilia Testudines Sphenodontia

  5. Reptile characteristics • Vertebrates=have backbone/internal skeleton • Cold blooded • Lay eggs on land (amnioteeggs) • Get oxygen from lungs • Dry scaly skin • Hatch into young adults • 3 chambered heart (alligators and crocodiles) • 2 aortic blood vessels • 4 or no legs • Internal fertilization

  6. “Fossil record” • Oldest fossil 315 million years - Hylonomus (late Carboniferous period)

  7. Life Cycle • Some lay their eggs and some give live birth. (oviparous) • Some reptiles stay with their parents when born • Grows becoming an adult • Female fertilize internally producing the eggs • They can reproduce more than once • After giving birth they die • Asexual reproduction

  8. LifeExpactancy • Giant Tortoise: 152 years • Box Turtle 123 years • Alligator 68 years • Snapping Turtle 57 years • Cobra 28 years • Cottonmouth 21 years

  9. Digestive System • Very simple • Mouth • Salivary gland- softens and moistens food • Esophagus- a tube in which the food goes from the pharynx to the stomach • Intestine- from stomach to anus • Cloaca- outlet intothe intestinal, urinary, and genital open • Eat • Most reptiles are carnivores feed on small invertebrates (mammals, reptile) • Some are herbivores feed on plant such as grasses, fruits, shrubs and marine plants.

  10. Respiratory System • Breath using lungs • Gas exchange in reptiles occurs in the alveoli ( diaphragm) • Breathing occurs in a change in the volume of the body cavity. • Controlled by contraction of intercostalmuscles. • Turtles and tortoise • Ventilation of the lungs • sheets of muscle in the shell that, through contraction and relaxation, force air in and out of the lungs

  11. Circulatory System • Closed system • 3 chambered hearts with two atria • Blood flows through heart • Mixing of oxygenated and deoxygenated blood

  12. Sensory System • They feel pain, temperature, pressure, and stretching at the dermal level. • Crocodilia • Vertical cat-like pupil excellent diurnal / nocturnal vision • External ears • Eardrums • Nostril • Squamata • Eyelids- spectacle • Smell with their tongue • Ears • Testudines • smell • Ears: only hear vibrations and changes in water pressure • Night vision

  13. Sensory System • Sphenodontia • Great vision • Third eye • Weak taste buds

  14. Bibliography • http://staff.tuhsd.k12.az.us/gfoster/standard/breptil.htm • http://animals.about.com/od/zoologybasics/a/howmanyspecies.htm • http://cowgirljess.hubpages.com/hub/The-Four-Groups-of-Reptiles • http://honorsbiologyp6.wikispaces.com/Reptiles+-+Sensory+Systems • http://www.exoticpetvet.net/reptile/rerepro.html • http://www.britannica.com/EBchecked/topic/498684/reptile/38474/Digestive-and-urogenital-systems • http://www.sandiegozoo.org/animalbytes/t-lizard.html

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