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Balanoglossus lives in burrows in the intertidal sandy areas.
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Its body is long cylindrical.
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In its pharynx 'U' shaped gills are present with increase in its age the number of gills will increase in number.
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Each gill has two lobes.
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These two lobes are separated by tongue bar. This tongue bar is hollow.
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It contains coelom.
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Each gill opens into pharynx.
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Near by gills are separated by septa are present.
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Gill is supported by gill bar.
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These gill bars are primary and secondary.
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They are transversely connected by synaptaculae.
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The gills are supplied with blood capillaries.
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These gills open out through gill slits.
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The water from pharynx will enter into the gills.
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Oxygen present in this water will diffuse into the blood of blood capillaries present in the walls of gills like that C02 from blood will diffuse into the water.
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Thus branchial respiration is carried on in Balanoglossus.
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