| Embryology of sea urchin: 2- cells stage |
 | - Large (92 Kb)
- Scroll down
to information
Without labels
Legend:
1 blastomere (1 out of 2 daughter cells)
2 blastomere (other out of 2 daughter cells)
3 fertilization membrane
4 first cleavage plane
| |
English name: Sea urchin
Scientific name: Psammechinus sp.
Familia: Echinidae
Classis: Echinoidea
Phylum: Echinodermata
Regnum: Animalia
|
Due to the equal divison of yolk over the two blastomeres, the fertilized egg undergoes a complete cleavage: holoblastic cleavage (holo = complete; blasto = germ).
To next stage.
One stage back. |