Tube within a tube body plan is shown by
Coelenterates
Platyhelminthes
Aschelminthes
Porifera
Digestion in Aschelminthes
The digestive system is complete with a distinct mouth and anus. Therefore, they have a tube-within-tube type of body plan. Digestion is extracellular. Stomach is absent.
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In Aschelminthes, the digestive system is complete with a distinct mouth and anus. Therefore, they have a tube-within-tube type of body plan. Digestion is extracellular. Stomach is absent.