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Vertébrés
Caractères dérivés propres :
– Vertèbres entourent la corde. Chez les vertébrés d’émergence plus récente, la corde disparait au profit des vertèbres, ne laissant que des reliques entre les vertèbres.
– Présence d’un crâne
– Minéralisation du squelette implique le phosphate de calcium
– Deux canaux semi-circulaires dans l’oreille interne pour l’orientation (système vestibulaire)
– Système de lignes sensorielles latérales, pourvu de neuromastes
– Musculature extrinsèque de l’œil
– Apparition de la rate et du pancréas
– Le cœur se cloisonne en chambres cardiaques
– Régulation nerveuse du cœur
– Différenciation des somites épibranchiaux et hypobranchiaux
– Système nerveux central tubulaire s’élargit à l’avant : divisé en 3 parties
– Reins développés à partir des mésonéphridies et métanéphridies
– Système circulatoire généralisé
