The digestive system of Platyhelminthes is branched and incomplete, with the mouth serving also as an excretory pore.
Cestodes like the tapeworms have tiny projections throughout the body surface known as microvilli which increase the surface area and promote the absorption of nutrients from the host.
Phylum Platyhelminthes includes the flatworms which are acoelomate, i.e. do not have a coelom or body cavity. Most flatworms are parasitic in nature and derive their nutrition from a host. These types of worms (cestodes) possess tiny projections called microvilli that are present all over the body surface since they lack a digestive system.
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