Multicellular parasites such as worms.. Flatworms or flat. Roundworms or nematodes

Divided parasitic worms, since outer shape to:

1 - flatworms: flat or body such as:

** Schistosomiasis

** Tapeworm.

2 - Roundworms: filamentous or a cylindrical body tapered at both ends, such as:

** Ascaris

** Hookworm.