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Exelastini

zoologie - Deutérostomiens

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Biology
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Lepidoptera
Zoology
Entiminae
Exelastini
Exelastis pilum
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Jean Roux

Les Deut?rostomiens ? premi?re vue, les ?toiles de mer et d'autres ?chinodermes semblent avoir peu en commun avec l'embranchement des cord?s qui comprend entre autres les vert?br?s. Cependant, ces animaux partagent les caract?ristiques deut?rostomiens. D?veloppement proto- et deut?rostomien Traits d?veloppementaux des Deut?rostomiens: 1) Zygote subit une segmentation radiale 2) Un d?veloppement ind?termin?: le destin des cellules n'est fix? que tard dans la morphog?n?se 3) M?soderme et coelome form?s par ?vagination de la paroi interne de la gastrula 4) Blastopore ("bouche" de la gastrula) devient l'anus, la bouche se forme ? parti d'une nouvelle ouverture du c?te oppos?
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