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How many invertebrate subphyla are there?

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There are two invertebrate subphyla: the Urochordata, or tunicates , and the Cephalochordata, or lancelets. A third invertebrate group, comprising the acorn worms and their relatives, shows affinities with chordates and has sometimes been considered a chordate subphylum, but is now often classified in a phylum of its own, the Hemichordata .

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