Balanoglossus is a marine,tubicolous or burrowing hemichordates inhabiting shallow coastal waters of intertidal zone,but a few occur in deeper water.B.clavigerus lives inside a u-shaped tube or burrow with the two vertical limbs 50-75 cm deep and two opening 10-30 cm apart .The anterior opening of burrow is funnel shaped and posterior end is rounded and concealed below the spirally coiled faecal matter of the animal.
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