1 fertilization membrane 2 blastomeres (4x) 3 first cleavage plane 4 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. To next stage. One stage back.
