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• Atuais:<br />
– Vértebras mais unidas, constringindo a notocorda, com aumento dos<br />
arcos hemal e neural.<br />
– Surgimento da coluna vertebral<br />
– Vértebras anficélicas – bicôncava<br />
– Diferenças nas vértebras do tronco das da cauda<br />
– Costelas dorsais<br />
Chondrichthyes
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