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Phylum: Chordata
Subphylum: Vertebrata
The vertebrates, also known as craniates, are animals that possess a vertebral column with spinal cord and cranium which protects the brain.Vertebrates make up approximately 65,000 species and is the largest subphylum in the phylum Chordata. This includes mammals, birds, amphibians, etc.
Class: Chondrichthyes
Class of jawed fish that contains skeletons primarily composed of cartilage.
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Class: Osteichthyes
Class of bony fish that possess endoskeletons composed of bone tissue with a vast majority of extant species.
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Class: Agnatha
Class of jawless fish, also known as lampreys and hagfish, consisting of both living and extinct clades.
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Class: Amphibia
Class of both aquatic and terrestrial amphibians including frogs, toads and salamanders, also known for their "double life".
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Class: Aves
Class of endothermic vertebrates known as birds which are characterized by feathers, wings, beaks and the laying of eggs.
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Class: Reptilia
Class of tetrapods with ectothermic metabolism and amniotic development.
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Class: Mammalia
Class of vertebrates that are characterized by producing milk to feed their offspring, possessing fur or hair and are warm-blooded.
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Subphylum: Urochordata (Tunicates)
Marine filter feeders, including sea squirts, that have a notochord and nerve cord only during their larval stage.
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Subphylum: Cephalochordata (Lancelets)
Small, fish-like marine animals that have a notochord and nerve cord throughout their lives but lack a backbone.
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