It include marine,solitary or colonial and mostly tubicolous.
Body is soft, fragile,vermiform,unsegmented,bilaterally symmetrical and triploblastic.
Body is divided into three regions proboscis,collar,and trunk.
Body wall of a single-layered epidermis with mucuous glands.
Coelom is enterocoelous, usually divided into protocoel,mesocoel and metacoel.
Digestive tube complete,straight or u-shaped.
Ciliary filter feeders.
Circulatory systems simple and open.
Excretion by a single proboscis gland.
Nervous system primitive.Dorsal collar nerve cord hollow.
Reproduction mainly sexual.
Fertilization external in sea water.Leads to tornaria larva.
Body is soft, fragile,vermiform,unsegmented,bilaterally symmetrical and triploblastic.
Body is divided into three regions proboscis,collar,and trunk.
Body wall of a single-layered epidermis with mucuous glands.
Coelom is enterocoelous, usually divided into protocoel,mesocoel and metacoel.
Digestive tube complete,straight or u-shaped.
Ciliary filter feeders.
Circulatory systems simple and open.
Excretion by a single proboscis gland.
Nervous system primitive.Dorsal collar nerve cord hollow.
Reproduction mainly sexual.
Fertilization external in sea water.Leads to tornaria larva.
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