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Cross section through the gill of a lancelet
Legend:
1 dorsal fin
2 epidermis
3 neural tube
4 notochord
5 myomere
6 myoseptum
7 epistyle
8 gill plates
9 endostyle
10 pharynx
11 prebranchial cavity
12 transverse muscle
13 metapleural fold
English name: Lancelet
Scientific name: Branchiostoma lanceolatum
Familia: Branchiostomidae
Classis: Cephalochordata
Phylum: Chordata (primitive)
Regnum: Animalia
