Kingdom Animalia Phylum Chordata Most are classified as VERTEBRATES – organisms with a backbone

Supraclass Pisces Fish Ectothermic - cold-blooded Gills for gas exchange Water habitat Scavengers, carnivores, predators, parasites Swim with fins External fertilization (bony fish) Separate sexes Bilateral symmetry

Class Agnatha Jawless Fish – lampreys & hagfish Lampreys: live in salt and freshwater Parasitic- round mouth lined with teeth Slimy skin, no scales

Hagfish: scavengers Use 6 short tentacles surrounding the mouth to find its food Blind

Class Chondrichthyes Cartilaginous Fish – shark, ray, & skates Sharks paired fins streamlined bodies predators - rely on sense of smell and movement Rays and Skates flat, wide bodies with long thin tails for life on ocean bottom large pectoral fins (look like wings)

Class Osteichthyes Bony Fish – ex. Perch, trout, bass scales covering the body skeleton made of bone swim with the aid of fins have swim bladder that works like a balloon

Class Amphibia – frogs, toads, salamanders, & newts Characteristics “Double Life” -lives part of its life in water and part on land ectothermic no scales or claws Have thin, moist skin

larvae are herbivores, adults carnivores larva have tails to move in water external fertilization with no parental care lay eggs without shells in water

Body Plan Bilateral symmetry 3 chambered heart Larvae breathe through gills; adults breathe through lungs Breathe through thin, moist skin (produces mucus) Changes from larva to adult through the process of metamorphosis

Class Reptilia – snakes, lizards, turtles, alligators Characteristics First vertebrate to live and reproduce entirely on land Ectothermic Carnivores or omnivores Have scales and claws Internal fertilization with no parental care Lay amniotic eggs with leathery shells

Body Plan Bilateral symmetry 3 chambered heart Breathe through lungs Dry, scaly skin prevents water loss

Class Aves Birds Characteristics Endothermic Has feathers and two legs covered with scales Front limbs are wings Beaks, claws and good vision help birds get food Carnivores, herbivores, insectivores Internal fertilization Amniotic eggs with hard outer shell

Body Plan Wings 4-chambered heart Lungs Hollow bones Strong breast muscles

Class Mammalia Characteristics Hair or fur at some stage of development Give birth to live young (except Monotremes) Endotherms Herbivores, carnivores and omnivores Walk, swim, or fly Sexual (egg and sperm) with separate sexes Internal fertilization

Body Plan Internal skeleton Complex organ systems Mammary glands (for milk) Four-chambered heart Lungs

Marsupials (live young develop in a pouch) Monotremes (lay eggs) Duckbill platypus Marsupials (live young develop in a pouch) Kangaroos, koalas Placental (young develops internally) 12 Orders with examples such as Primates Bats Whales & dolphins Walrus & seals Hoofed livestock Rodents Bears Elephants

Monotreme Marsupials