Chorde se prolonge au niveau de la
tête (=céphalon)
Exemple Amphioxus
Tégument unistratifié
Succession de muscles (myomères)
Pas de crâne
Animaux marins ( 5 -7 cm de long)
Nombre d’espèces : 13
A : anus ; B : bouche ; C : chorde ; Ch :
caecum hépatique ;
G : gonades ; I : intestin ; M : moelle ; Me :
métapleure ; My : myotome ;
N : nageoire ; Pa : pore abdominal ; R :
rostre
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Very nice article thanks so much
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Very nice article thanks so much
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Very nice article thanks so much
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je n'est rien compris a ça
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Thank you great
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free good post thanks
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Des informations précises et des chiffres sont quelque chose d'intéressant merci
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Thanks for the information
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Great thanks
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