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Embryology of sea urchin: early gastrula (initial phase)

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ectoderm
begin of archenteron
endoderm
blastoecoel (central)
direction of invagination

 
English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
Blastomeres migrate from the vegetal pole inward during the so-called invagination or gastrulation process (according to the direction of the arrows at 5). In this way the ecto- and endoderm are formed. The endoderm covers the developing primitive gut, called archenteron (arche = original - primitive, enteron = gut).
To next stage.
One stage back.

http://www.vcbio.science.ru.nl/en/image-gallery/show/AN0094/print/

last modified: 5 Jun 2014