Phylum Chordata - Chordates Internal skeleton with muscle ...
Phylum Chordata - Chordates Internal skeleton with muscle ...
Phylum Chordata - Chordates Internal skeleton with muscle ...
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The vertebrates are composed of eight classesFour classes are aquatic fishesClass Myxini - HagfishClass Cephalaspidomorphi - LampreysClass Chondrichthyes - Sharks, skates and raysClass Osteichthyes - Bony fishesFour classes are terrestrial tetrapodsClass Amphibia - Salamanders, frogs and toadsClass Reptilia - ReptilesClass Aves - BirdsClass Mammalia - MammalsCharacteristics of FishesGills - extract dissolved oxygen from water around themwater passes over filaments rich in blood vesselsblood moves opposite the flow of water - an efficient systemVertebral column<strong>Internal</strong> <strong>skeleton</strong> <strong>with</strong> spine surrounding dorsal nerve cordSkeleton may be made of cartilage or boneBrain fully encased in protective skull
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