| Embryology of sea urchin: 4-cells stage |
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Legend:
1 fertilization membrane
2 blastomeres (4x)
3 first cleavage plane
4 second cleavage plane
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English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
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In this isolecithale egg type the cleavage planes are oriented orthogonally (perpendicular) and radially (star-like) relative to each other.
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