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Embryology of sea urchin: early gastrula (proceeding)
Legend:
1 ectoderm
2 archenteron (central)
3 endoderm
4 first group mesoderm cells
5 origin first group migrating mesoderm cells
6 origin second group mesoderm cells
7 invagination location
English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
Individual cells migrate to the inside (4) from the base (5) of the growing archenteron (2) . This first group of migrating mesoderm cells (= mesenchym) will later form the skeleton. A second group of mesoderm cells (6) separates from the upper part of the archenteron. These cells will form the wall of organs of the see urchin.
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