*Phylum Chordata - Have all 4 chordate characteristics some time during their life.
Notochord - Flexible dorsal rod that becomes your backbone.
Dorsal (hollow) nerve cord - Spinal cord.
Pharyngeal gill slits - In throat region - used for filter feeding or breathing
Postanal tail - Tail forms behind/after the anus.
Subphylum Urochordata - Marine filter feeders (invertebrates)
( Sea Squirts )
Subphylum Cephalochordata - Marine filter feeders (invertebrates)
( Lancelets )
Subphylum Vertebrata - Animals that have a backbone - cephalization, jointed internal skeleton and paired limbs.
Class Agnatha - Cartilaginous fish that have no jaws, like lampreys.
Class Chondrichthyes - Cartilaginous fish that have jaws.
Class Osteichthyes - Bony fish, skin with scales, gills, and 2 chambered heart.
Class Amphibia - Frogs, toads, and salamanders - Have moist skin and no scales, usually 4 limbs and a 3 chambered heart.
Class Reptilia - Snakes, turtles, lizards and crocodiles - Dry scaly skin, lungs, and lay eggs with shells.
Ectotherm - The animal's source of heat is mainly external.
Endotherm - The animal's source of heat is internal.
Class Aves - Have feathers, wings, hollow bones, shelled eggs, lack teeth, and have a 4-chambered heart.
Class Mammalia - Have body hair, mammary glands, a muscular diaphragm, unique and diverse teeth, and a well developed brain.