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Embryology of chicken; 18 hours after fertilization

Legend:

1  proamnion
2  area opaca 
3  area pellucida
4  embryonal area
5  neural plate
6  notochord
7  Hensen's node
8  primitive streak

English name: Common chicken
Scientific name: Gallus domesticus
Familia: Phasianidae/Meleagridae
Classis: Aves
Phylum: Chordata (subphylum vertebrata)
Regnum: Animalia