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Chordata is a phylum, vertabrate (vertabrata) is a sub-phylum. Although this is not well-known, the phylum chordata contains some (very few) invertabrates (animals without a backbone) such as sea squirts. So the phylum chordata is futher classified into 2 sub-phyla, vertabrata (vertabrates) and invertabrata (invertabrates).

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15y ago

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