All UK Exam Boards included


Platyhelminthes (e.g. flatworm) body form

Flatworms like the liver fluke are bilaterally symmetrical and flattened dorso-ventrally. This means they are flat back (top) to front (bottom). Their bilateral symmetry means they are identical when split into two, lengthways in this case (unlike Cnidaria which are radially symmetrical).

They have a single opening (mouth) to the gut. Its flat body tissues support its body structure, with no specialised skeletal system. Many flatworm species are parasitic. They do not have an internal body cavity, circulation and respiratory systems, but do have a brain (in the sense of a more concentrated neuronal network in the front part of their body i.e. the head).

The flatworm lives in water or wet environments such as leaf litter, and has its flattened body in order to maximise diffusion across its body. The minimised diffusion pathway ensures it is quick enough to enable good gas exchange.

Having no anus, they regurgitate food as part of digestion, and hence cannot undergo a continuous process of digesting food.

Ok byeeeeeeeee





Sorry! There are no posts.

Sorry! There are no posts.

Our Reviews

You explain everything so simply! 

SecretDuck The Student Room

Thank you!! Your site is so helpful!

studyaspect YouTube

I bookmarked the site 

translucent The Student Room

wow just checked out your website and think it’s pretty cool.

Eager bug The Student Room

Thank you for the help, your website and videos are awesome

pika mart YouTube