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Embryology of sea urchin: 4-cells stage

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fertilization membrane
blastomeres (4x)
first cleavage plane
second cleavage plane

English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
In this isolecithale egg type the cleavage planes are oriented orthogonally (perpendicular) and radially (star-like) relative to each other.
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last modified: 5 Jun 2014