Balanoglossus has a spacious coelom lined by coelomic epithelium and enterocoelous in origin .The adult coelom is represented by five separate cavities which originate as independent pouches from the archenteron of the embryo.
Proboscis coelom-The proboscis coelom communicates with the outside through a proboscis canaland a proboscis pore situated mid-dorsally at the base of the proboscis stalk.The unpaired proboscis coelom or protocoel is greatly obliterated by connective tissue and muscle strands.
Collar coelom-The collar coelum or mesocoel is represented by two narrow lateral cavities.The collar coelum does not communicates with the proboscis coelum.
Trunk coelum-The trunk coelum or metacoel is represented by a pair of closed cavities between the body wall and gut wall.The trunk coelum is obliterated by the musculature.
Coelomic fluid-The coelomocytes originate from the coelomic epithelium.The trunk coelom is filled with a watery coelomic fluid containing amoeboid coelomocytes,each with a large vacuole.
Proboscis coelom-The proboscis coelom communicates with the outside through a proboscis canaland a proboscis pore situated mid-dorsally at the base of the proboscis stalk.The unpaired proboscis coelom or protocoel is greatly obliterated by connective tissue and muscle strands.
Collar coelom-The collar coelum or mesocoel is represented by two narrow lateral cavities.The collar coelum does not communicates with the proboscis coelum.
Trunk coelum-The trunk coelum or metacoel is represented by a pair of closed cavities between the body wall and gut wall.The trunk coelum is obliterated by the musculature.
Coelomic fluid-The coelomocytes originate from the coelomic epithelium.The trunk coelom is filled with a watery coelomic fluid containing amoeboid coelomocytes,each with a large vacuole.
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