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Reptiles 10 3 goran drumev
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  • 1. Reptiles The most magnificent animals… By Goran Georgiev & Dimitar Drumev 10/3
  • 2. What are reptiles?
    • Reptiles are a group of furless amniotes.
    • Amniotes were early tetrapods that could survive in much drier environments.
    • They would lay amniotic eggs. These had an amniotic membrane around them.
    • Ancestors of birds, mammals, reptiles.
  • 3. What about them?
    • Reptiles have a bilateral symmetry.
    • Most closely related to mammals.
    • Easily distinguishable by their scales.
    • Most lay their eggs on land.
    • Most reptiles are also ectothermic.
    http://www.fizzicseducation.com.au/Online%20Store/large%20images/Frilled%20Neck%20Lizard4D.jpg http://image.tutorvista.com/content/diversity-living-organisms/flying-lizard-creeping-vertebrates-of-reptilia-class.jpeg
  • 4. Clades
    • There are a lot of extinct reptiles. Generally divided into these 4 orders:
    • Crocodilia (alligators and crocodiles) - 23 species
    • Sphenodontia (tuatar as from New Zealand) - 2 species
    • Squamata ( lizards , snakes, and worm lizards) ~ 7,900 species
    • Testudines (turtles and tortoises) ~ 300 species
  • 5. Where do they belong?
    • The oldest common ancestor they had with humans was 530 MYA.
    • They belong to the Chordate phylum.
    • Chordates are very complex and evolutionary advanced animals that have a backbone.
  • 6. How do they move?
    • Most tetrapods simply walk with legs.
    • Snakes and legless lizards sliver on the ground in an S motion.
    • Some reptiles can glide in the air.
    • Most reptiles are also excellent swimmers.
  • 7. What about reproduction?
    • Fertilization is internal and then the eggs are laid (or oviposition )
    • Some are viviparous – they bare live young.
    • Others lay eggs inside themselves, the eggs hatch and then the female gives birth ( gravid ).
  • 8. Nervous System
    • Same basic parts as all amphibian brains.
    • Sense organs are developed except for snake’s lack of ears.
    • Most brain analysts suggest they are less intelligent than mammals or birds.
    • Excluding crocodiles, brain to body proportions are very small.
  • 9. Pelochelys cantorii – Cantor‘s giant soft-shelled turtle
    • Grows up to 2 meters in length.
    • Fresh water predator turtle that
    • feeds on fish
    • It is endangered. Lays ~30 eggs in the first quarter of the year.
    • Spends 95% of life buried and motionless.
  • 10. Ophiophagus hannah – King Cobra
    • Longest venomous snake – 5/6
    • meters long.
    • Dedicated parents – one of few
    • snakes to stay with its eggs.
    • Very fierce and agile predator.
    • Produces huge amounts of venom in just one bite.
  • 11. Crocodylus porosus S altwater crocodile
    • Largest of all living reptiles.
    • Found in India, Asia and
    • Northern Australia.
    • Species can weight more than 1250kg and be 6 meters in length.
    • Their diet consists of sharks (including bigger ones), kangaroos, monkeys and wild boars.
  • 12. Humans & Reptiles
    • We are the reason for the endangerment of a lot of reptiles.
    • We use alligator skin to make bags, wallets, belts, etc.
    • Some reptiles considered delicacies in certain countries.
    • Snake venom sometimes used in medicine.
  • 13. Trivia
    • What does the Bulgarian word рептили ( reptili) mean?
    • Which statement about snakes is NOT true?
    • A.  Snakes never stop growing. B.  You can tell the age of a rattlesnake by the number of its rattles. C.  Snakes are found on all continents except Antarctica. D.  There are approximately 2700 species of snakes in the world.