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Urochordata and Cephalochordata
lancelet branchiostoma
phylum Chordata, subphylum CephalochordataLancelets are a member of the phylum chordata. They belong to the subphylum cephalochordata. They are found in tropical seas.
It is the stomach of Chordata, namely of the taxon Cephalochordata.
The phylum of Amphioxus is Chordata.