Saw several of this Flatworm species swimming around last night, they were only about 25mm long & very difficult to photograph at night & on the move
The flatworms – Phylum Platyhelminthes – comprise a very diverse group of worms, with over 10,000 species described. Included within this large phylum are parasitic flatworms, such as tapeworms and liver flukes. Unlike many other kinds of worms, such as earthworms, flatworms do not have a body cavity containing organs – instead the body is a solid mass of tissue. There is no circulatory system either, and flatworms rely on diffusion to convey nutrients and waste products between cells. That is why flatworms are so flat and thin: no part of the interior of the body is far from the surface.