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Cross section through the tail of a lancelet

Legend:

1  dorsal fin
2  epidermis
3  neural tube
4  notochord
5  myomere
6  myoseptum
7  hindgut
8  caudal fin

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