Through the view point of evolution doliolum is considered as a connecting link between Non chordates and chordates
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Balanoglossus is connecting link between non chordates and chordates give reason
However the Balanoglossus is considered an important connecting link between chordates and non-chordates (vertebrates and invertebrates) as they have notochord, gill-slits (branchial openings) and the dorsal tubular nerve cord which are the three main characteristics of chordates.
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