|Branchiostoma lanceolatum from Belgium|
|About 11 species|
Amphioxus Yarrel, 1836
These small vaguely eel- or snake-like animals are close relatives of vertebrates. The scientific name means "gill-mouth", referring to their anatomy – unlike vertebrates, they do not have a true head (with a skull capsule, eyes, nose, a well-developed brain etc.), but merely a mouth adjacent to the gill-slits, with the slightly enlarged anterior end of the dorsal nerve cord above and in front of them. It dislikes the light.
- "Report of the United States Commissioner of Fisheries for the fiscal year 1928 with appendixes — Part II" (PDF). 1928. Retrieved 18 August 2017.
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