Webb, J. E. University College, Ibadan, Nigeria.
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A subphylum of the phylum Chordata comprising the lancelets, including Branchiostoma (amphioxus). Cephalochordates (also known as the Leptocardii) are small fishlike animals, not exceeding 80 mm (3.2 in.) in length. They burrow in sand on the ocean bed or in estuaries in tropical and temperate regions throughout the world. Three genera are recognized in Cephalochordata: Branchiostoma with 23 species, Epigonichthys with 5 species, and Asymmetron with 2 species. See also: Chordata
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