Diversity of Chordates

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!)

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

Class Chondrichthyes: Cartilaginous Fish

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

Class Osteichythyes: Boney Fish

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

Class Amphibia

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!

Class Reptilia

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

Class Aves: Birds

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)

Class Mammalia: Mammals

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

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

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