Vertebrates May, 2012

Vertebrates Vertebrates Animals with a backbone

Vertebrates Phylum: Chordata Characteristics Backbone Backbone (vertebrate) surrounds and protects a nerve cord Skull and vertebrate are made of either bone or cartilage

Vertebrate Characteristics (cont) 4. Endotherms (warm-blooded animals) that maintained a constant body temperature 5. Ectotherms (cold-blooded animals) that body temperature changes with their environment

Fish Class Examples- minnows, blue gills, clown fish Characteristics 1. Fins- help the fish move steer, stop, and balance 2. scales- protect the body 3. Well developed sense of vision, hearing, taste, and smell 4. lateral line system- row of sense organs

Fish Class Characteristics 5. Breathe with gills 6. External and internal fertilization

3 types of fish 1. Jawless fish- eel like fish, smooth, slimy, no jaw 2.Cartilaginous fishes- have cartilage, no bones, strong jaws SHARKS! 3.Bony fishes- bony skeleton, can float in place without swimming because they have a swim bladder Swim bladder- balloon like organ filled with oxygen and other gases that gives the fish buoyancy

Bell Work Define the following terms 1. endotherm 2. ectotherm 3. swim bladder 4. Name 2 characteristics of fish

Amphibian Class 1. Amphibians evolved from fish and to adapt to life on land they needed lungs for breathing 2. Lung- saclike organ that takes oxygen from the air and delivers it to the blood

Amphibian Characteristics 1. Amphibian means “double life” because they live in water and on land 2. Eggs do not have a shell or membrane to prevent water loss so they are laid in water 3. Ectotherms 4. Skin is smooth and slimy 5. They don’t drink water, they absorb it through their skin

Amphibian Characteristics (cont.) 6. breath by taking air into their lungs and they absorb it through their skin 7. Their skin is so thin and moist they must live in water or in damp habitats 8. Their skin is brightly colored to warn predators away. This is called warning coloration. 9. 3 chambered heart 10. Turn to page 70. in your book and draw the life cycle of a frog.

Metamorphosis Frog Metamorphosis

Kinds of Amphibians 1. Caecilians- shaped like worms or snakes, they have no legs. They live in tropical areas 2. Salamanders- live under stones or logs in damp woods

Kinds of Amphibians 3. Frogs and toads have powerful legs for jumping, well developed ears for hearing, sticky tongues, and vocal cords for calling Vocal sac-thin sac of skin that inflates with air and vibrates

Reptiles 1. Some amphibians evolved special traits that prepared them for life in a drier environment 2. They developed thick, dry skin that protected them from water loss 3. Their legs were stronger so they could walk and they evolved a special egg that could survive on dry land

Reptile Characteristics 1. Some reptiles live in water but they use lungs to breathe air 2. Thick dry skin, that is water tight and prevents losing water by evaporation 3. Ectothermic 4. Amniotic egg-surrounded by a shell that protects an developing embryo (most important adaptation) 5. Internal fertilization 6. 3 chamber heart

Types of Reptiles 1. Turtles and Tortoises 2. Crocodiles and Alligators 3. Lizards 4. Snakes

Bell Work 1. Name the 4 types of reptiles. 2. What animal group did reptiles evolve from? 3. Are reptiles ectothermic or endothermic? 4. Name 3 characteristics of reptiles?

Tuatara Oldest living reptile

Birds 1. Class: Aves 2. Birds are thought to be descendants of dinosaurs 3. Share some characteristics with reptiles A. Bird legs and feet are covered with thick dry scales like reptiles B. Both have amniotic eggs with a shell

Bird Characteristics 1. Beaks instead of teeth or jaws 2. Feathers 3. Wings 4. Need a lot of energy to be able to fly 5. Eat large amounts of food

Bird Characteristics 6. Air Sacs- special sacs attached to the lungs that increases the amount of oxygen that birds can take in 7. Lighter skeletons- hollow bones 8. 4 chamber heart 9. Endothermic

Kinds of Birds 1. Flightless Birds 2. Water Birds 3. Birds of Prey A. penguins B. ostrich 2. Water Birds A. ducks B. loons 3. Birds of Prey A. owls B. hawks

Kinds of Birds 4. Perching birds 5. Non Perching birds A. cardinal B. chickadees 5. Non Perching birds A. red-bellied wood pecker

Bell Work 1. Name 4 characteristics of Fish Amphibians Reptiles Birds

Mammals

Origin of Mammals Fossil evidence shows 280 million years ago there were mammal-like reptiles called therapsids

Characteristics of Mammals 1. Mammary glands- secrete nutritious milk 2. Endothermic 3. Hair somewhere on their bodies 4. Specialized teeth 5. 4 chamber heart 6. Large brains

Characteristics of Mammals 7. Require oxygen to burn or break down the food they eat 8. Diaphragm- muscle at the bottom of the rib cage that moves and helps with inhaling and exhaling 9. Produce sexually

Kinds of Mammals 1. Monotremes- mammals that lay eggs A. have mammary glands B. echidnas C. duckbilled platypus

Kinds of Mammals 2. Marsupials- mammals with pouches A. have mammary glands B. opossums C. kangaroos D. koalas E. Tasmanian devils

Kinds of Mammals 3. Placental-embryos stay in an organ called an uterus in the mother. The placenta in the uterus supplies food and oxygen to the embryo. Examples Pigs Horses Dolphins Whales Humans 4.Gestation period- time that the embryo develops in the mother