| Embryology of sea urchin: probably 128- cells stage - morula |
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1 blastomeres
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English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
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Multicellular stage (probably 128 blastomeres). While cleavages proceed a so-called morula (morula = mulberry) is formed. In this stage the cytoplasm of the fertilized egg cell is compeltely divided over the blastomeres. Notice that this group of more than 100 cells is of about the same size as the original fertilized egg cell.
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