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Diversity of Chordates

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Presentation on theme: "Diversity of Chordates"— Presentation transcript:

1 Diversity of Chordates

2 Class Agnatha: Jawless Fishes
Lamprey and Hagfish Gills single loop, 2 chambers Unpaired fins, muscles External Fertilization Ectotherms Slimy/mucus-y Salt and fresh water Notochord remains thru adulthood Rasping Tongue (parasites!)

3 Class Chondrichthyes: Cartilaginous Fish
Sharks, Skates, Rays Gills Single loop, 2 chambers Paired fins, muscles External Fertilization, some internal (sharks) Ectotherms Scales Most salt water Males have structures for internal fertilization (claspers Some have lateral line system

4 Class Chondrichthyes: Cartilaginous Fish

5 Class Osteichythyes: Boney Fish
Trout, salmon, etc Gills Single loop, 2 chambers Paired fins, muscles External fertilization, “spawning” Ectotherms Scales Fresh and salt water Ray finned, Lobe finned Swim bladder Lateral Line System

6 Class Osteichythyes: Boney Fish

7 Class Amphibia “Double Life” Gills, Lungs, Skin
Double loop, 2 chambers Limbs stick out sideways, muscles/ligaments Mostly external fertilization Ectothermic Smooth, moist skin Near fresh water Frogs/Toads, Salamanders, Caecilians Tympanic Membrane Metamorphosis

8 Class Amphibia

9 Class Reptilia Lungs Double loop, 3 or 4 chambers
Limbs point towards ground, muscles/ligaments Internal fertilization, Amniotic Egg Ectothermic Dry, Scaley skin Tropical and Temperate climates Turtles/Tortoises, Crocodilians, Lizards, Snakes, DINOSAURS!

10 Class Reptilia

11 Class Aves: Birds Adaptations for flight: Lungs
Feathers, upper limbs are wings, hollow bones Lungs Endothermic; very high body temperature Double loop, 4 chambers Internal fertilization, Amniotic egg Endothermic Live everywhere Feathers; scales on feet/legs

12 Class Aves: Birds

13 Class Mammalia: Mammals
Mammary Glands, nurse offspring Lungs Double loop, 4 chambers 2/4 legs, muscles Endothermic Live everywhere Placental, Marsupials, Montremes Fat to insulate Various teeth depending on food (herbivore, omnivore, carnivore, etc)

14 Class Mammalia: Mammals

15 Mammals Placental Mammals
Offspring are carried inside the mother until development is almost complete Nourishment and oxygen provided via placenta

16 Mammals Marsupials Short period of development inside mom
Second period of development in a pouch made of hair and skin

17 Mammals Montremes Egg laying mammals Have hair and mammary glands
Only found in Australia, New Guinea, and Tasmania Echidnas and Platypuses

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