Phylum:

Chordata

Superclass:

Agnatha

Key Characteristics:

Jawless, vertebral column

Photo Credit: Anglersnet.co.uk

Phylum:

Chordata

Class:

Chondrichthyes

Key Characteristics:

Jaws, cartilage skeleton

Photo Credit: cbsnews.com

Phylum:

Chordata

Superclass:

Osteichthyes

Class:

Actinopterygii

Key Characteristics:

Boney skeletons, lungs or lung derivatives

Photo Credit: Homederby.com

Phylum:

Chordata

Class:

Amphibia

Key Characteristic:

Legs

Photo Credit: Wikipedia, Charles H. Smith

Phylum:

Chordata

Class:

Reptilia

Key Characteristic:

Amniotic eggs

Photo Credit: Popularpets.net

Phylum:

Chordata

Class:

Mammalia

Key Characteristics:

Endothermic, mammary glands

Photo Credit: Sarah Hummel

Phylum:

Chordata

Class:

Aves

Key Characteristics:

Hollow bones, feathers

Photo Credit: Exzooberance.com