Reptiles 10 3 goran drumev


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Reptiles 10 3 goran drumev

  1. 1. Reptiles The most magnificent animals… By Goran Georgiev & Dimitar Drumev 10/3
  2. 2. What are reptiles? <ul><li>Reptiles are a group of furless amniotes. </li></ul><ul><li>Amniotes were early tetrapods that could survive in much drier environments. </li></ul><ul><li>They would lay amniotic eggs. These had an amniotic membrane around them. </li></ul><ul><li>Ancestors of birds, mammals, reptiles. </li></ul>
  3. 3. What about them? <ul><li>Reptiles have a bilateral symmetry. </li></ul><ul><li>Most closely related to mammals. </li></ul><ul><li>Easily distinguishable by their scales. </li></ul><ul><li>Most lay their eggs on land. </li></ul><ul><li>Most reptiles are also ectothermic. </li></ul>
  4. 4. Clades <ul><li>There are a lot of extinct reptiles. Generally divided into these 4 orders: </li></ul><ul><li>Crocodilia (alligators and crocodiles) - 23 species </li></ul><ul><li>Sphenodontia (tuatar as from New Zealand) - 2 species </li></ul><ul><li>Squamata ( lizards , snakes, and worm lizards) ~ 7,900 species </li></ul><ul><li>Testudines (turtles and tortoises) ~ 300 species </li></ul>
  5. 5. Where do they belong? <ul><li>The oldest common ancestor they had with humans was 530 MYA. </li></ul><ul><li>They belong to the Chordate phylum. </li></ul><ul><li>Chordates are very complex and evolutionary advanced animals that have a backbone. </li></ul>
  6. 6. How do they move? <ul><li>Most tetrapods simply walk with legs. </li></ul><ul><li>Snakes and legless lizards sliver on the ground in an S motion. </li></ul><ul><li>Some reptiles can glide in the air. </li></ul><ul><li>Most reptiles are also excellent swimmers. </li></ul>
  7. 7. What about reproduction? <ul><li>Fertilization is internal and then the eggs are laid (or oviposition ) </li></ul><ul><li>Some are viviparous – they bare live young. </li></ul><ul><li>Others lay eggs inside themselves, the eggs hatch and then the female gives birth ( gravid ). </li></ul>
  8. 8. Nervous System <ul><li>Same basic parts as all amphibian brains. </li></ul><ul><li>Sense organs are developed except for snake’s lack of ears. </li></ul><ul><li>Most brain analysts suggest they are less intelligent than mammals or birds. </li></ul><ul><li>Excluding crocodiles, brain to body proportions are very small. </li></ul>
  9. 9. Pelochelys cantorii – Cantor‘s giant soft-shelled turtle <ul><li>Grows up to 2 meters in length. </li></ul><ul><li>Fresh water predator turtle that </li></ul><ul><li>feeds on fish </li></ul><ul><li>It is endangered. Lays ~30 eggs in the first quarter of the year. </li></ul><ul><li>Spends 95% of life buried and motionless. </li></ul>
  10. 10. Ophiophagus hannah – King Cobra <ul><li>Longest venomous snake – 5/6 </li></ul><ul><li>meters long. </li></ul><ul><li>Dedicated parents – one of few </li></ul><ul><li>snakes to stay with its eggs. </li></ul><ul><li>Very fierce and agile predator. </li></ul><ul><li>Produces huge amounts of venom in just one bite. </li></ul>
  11. 11. Crocodylus porosus S altwater crocodile <ul><li>Largest of all living reptiles. </li></ul><ul><li>Found in India, Asia and </li></ul><ul><li>Northern Australia. </li></ul><ul><li>Species can weight more than 1250kg and be 6 meters in length. </li></ul><ul><li>Their diet consists of sharks (including bigger ones), kangaroos, monkeys and wild boars. </li></ul>
  12. 12. Humans & Reptiles <ul><li>We are the reason for the endangerment of a lot of reptiles. </li></ul><ul><li>We use alligator skin to make bags, wallets, belts, etc. </li></ul><ul><li>Some reptiles considered delicacies in certain countries. </li></ul><ul><li>Snake venom sometimes used in medicine. </li></ul>
  13. 13. Trivia <ul><li>What does the Bulgarian word рептили ( reptili) mean? </li></ul><ul><li>Which statement about snakes is NOT true? </li></ul><ul><li>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. </li></ul>