Phylum Chordata

Phylum Chordata Includes the following classes: Class Myxini (hagfishes) Class Cephalaspidomorphi (lampreys) Class Chondrichthyes (cartilaginous fish) Class Osteichthyes (bony fish) Class Amphibia (amphibians) Class Reptilia (reptiles) Class Aves (birds) Class Mammalia (mammals)

Fish Diversity.avi Fish Fish are aquatic vertebrates that are characterized by paired fins (movement), scales (protection), and gills (exchanging gases). Bilateral body symmetry. Ex. Sharks, lampreys, perch

Fish There are many different types of fish that can be broken down into 4 different classes. The first 2 classes are jawless fish. Class Myxini (hagfish) Class Cephalaspidomorphi (lamprey) Class Chondrichthyes (cartilaginous fish such as sharks and rays) “chondr” = cartilage “ichthyes” = fish Class Osteichthyes (bony fish such as perch) “oste” = bone

Class Amphibia An amphibian is a vertebrate that, with some exceptions: Lives in water as a larva and on land as an adult Breathes with lungs as an adult Has moist skin that contains mucus glands Lacks scales and claws. Bilateral body symmetry Ex. Frogs, Toads, Salamanders

Intro to Reptiles.avi Class Reptilia Reptiles have dry, scaly skin, lungs, and terrestrial eggs with several membranes. Bilateral body symmetry Ex. Turtles, lizards, snakes, crocodiles

Owl Wings.avi Class Aves Birds are reptile-like animals that maintain a constant internal body temperature. They have feathers, two legs covered with scales, and front limbs modified into wings. Bilateral body symmetry. Ex. Parrot, Ostrich, Falcon, Cardinal

Shrew Babies.avi Class Mammalia All mammals are characterized by hair and mammary glands, which produce milk to nourish their young. Bilateral body symmetry. Ex. Bear, human, bat, seal