Why is balanoglossus placed under hemichordata as it has notochord while hemichordates doesnt have one?
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The main difference between Hemichordata and Chordata is that Hemichordata contains an epidermal nervous system whereas Chordata contains a central nervous system. Chordates contain a dorsal, tubular nerve cord. Both Hemichordata and Chordata contain pharyngeal gill slits
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Balanoglossus is placed under hemichordates as even though it has a notochord, it does NOT have the other characteristic features of chordates! Which is why it is a half chordate- HEMIchordate
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