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Cross section through the head of a lancelet (head 1)

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Legend:

1  dorsal fin
2  epidermis
3  neural tube
4  notochord
5  myomere
6  myoseptum
7  wheel organ / velum (?)
8  wheel organ (?)
9  transverse muscle
10  metapleural fold

 
English name: Lancelet
Scientific name: Branchiostoma lanceolatum
Familia: Branchiostomidae
Classis: Cephalochordata
Phylum: Chordata (primitive)
Regnum: Animalia

http://www.vcbio.science.ru.nl/en/image-gallery/show/AN0068/print/

last modified: 5 Jun 2014