1 / 26

Chordates

Chordates. Chordates. What is a chordate? 1. Has either a backbone or a notochord (vertebrate) 2. Can either be an ectotherm or an endotherm. Chordates. Endotherm (warmblooded) Has a stable body temperature Ectotherm (coldblooded) Can change body temperature due to the environment.

lillith-walker
Télécharger la présentation

Chordates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chordates

  2. Chordates • What is a chordate? • 1. Has either a backbone or a notochord (vertebrate) • 2. Can either be an ectotherm or an endotherm

  3. Chordates • Endotherm (warmblooded) • Has a stable body temperature • Ectotherm (coldblooded) • Can change body temperature due to the environment

  4. Chordates • 5 Major Catagories of Chordates • Fish • Amphibians • Reptiles • Birds • Mammals

  5. Amphibians • Amphibian- means “double life” • Why? • After beginning their lives in water, most amphibians spend their adulthood on land, returning to water to reproduce. (Lose gills and acquire lungs)

  6. http://video.nationalgeographic.com/video/player/animals/amphibians-animals/frogs-and-toads/frog_greentree_lifecycle.htmlhttp://video.nationalgeographic.com/video/player/animals/amphibians-animals/frogs-and-toads/frog_greentree_lifecycle.html

  7. Amphibians • 3 types/orders: • Anura (frogs and toads), • Caudata (salamanders and newts), and • Gymnophiona (caecilians, limbless amphibians that resemble snakes)

  8. Amphibians • What’s the difference between a frog and a toad? • 1. Many toads have lumps behind their eyes that contain poison that oozes out when they are attacked. • 2. Skin- • Frogs are moist and smooth • Toads are dry and bumpy

  9. Frog Dissection • What are the rules of lab? • How should we behave? • http://www.mhhe.com/biosci/genbio/virtual_labs/BL_16/BL_16.html

  10. Frog Dissection- Mouth

  11. Reptiles • An ectothermic vertebrate that has lungs and scaly skin. • Major Groups: • Lizards • Snakes • Turtles • Alligators • Crocodiles

  12. Reptiles • Unlike amphibians, which have a thin, moist skin, reptiles have dry, tough skin covered with scales. • Skin protects and helps keep water in their bodies.

  13. Reptiles • Lizards and snakes shed their skin. • All snakes are carnivores but not all lizards are. • Turtles have a shell made from their ribs and backbone.

  14. Reptiles • What is the difference between an alligator and a croc? • Alligators have broad, rounded snouts, with only a few teeth visible. • Crocodiles have pointed snouts, and you can see most of their teeth.

  15. Birds • Bird: an endothermic vertebrate that has feathers and a four-chambered heart, and lays eggs. • The rule is: • If it has feathers, it’s a bird.

  16. Birds • Feathers: • Contour: one of the large feathers that give shape to a bird’s body. • Flight: long contour feathers that extend beyond the body on the wings and tail. • Down: short, fluffy that are specialized to trap heat and keep a bird warm.

  17. Birds • Feed • Capture, grip and handle food, birds use their bills. • Bills specify per species • Internal storage tank called a crop • Birds do not have teeth, a gizzard performs the grinding function

  18. Birds • Adaptations for Flight • 4 chambered heart • Highly efficient respiratory system • Lightweight bones with air spaces

  19. Mammals • All mammals are endothermic vertebrates with a 4 chambered heart and skin covered with fur or hair.

  20. Mammals • All mammals have…. • 1. Hair or fur • 2. Mammary glands (feed with milk) • 3. Distinctive teeth • 4. Highly developed brain • 5. Extended care for the young

  21. Mammals • Three groups of mammals • Monotremes • Marsupials • Placental mammals

  22. Mammals • Monotremes • Mammals that lay eggs • Two species: • Spiny anteaters • Duck-billed platypuses

  23. Mammals • Marsupials • Young born alive at an early stage, but continue to develop in a pouch • Examples: • Kangaroos • Koalas • Wallabies • opossums

  24. Mammals • Placental Mammals • Develop inside a mother’s body until its body system can function independently. • Examples: • Insect-eaters • Flying mammals • Primates • Rodents • Rabbits/hares • Marine mammals • Hoofed mammals

More Related