The five main groups of vertebrates, known as classes, are: fish, amphibians, reptiles, birds and mammals. Vertebrate species are assigned groups based on shared traits, such as body covering, the ability to maintain a steady temperature and the number of chambers in the heart, among others.
Five Kinds of Vertebrates By Cindy Grigg 1 Vertebrates are all animals that have a backbone. Vertebrates are in the phylum Chordata. Chordates (or vertebrates) have internal skeletons called endoskeletons made of bone or cartilage. They each have a nerve cord that runs down their backs, known as a central nervous system. They have specialized.