David Fleetham / Close up of the pattern on the Hawaiian spotted flatworm (Pseudobiceros) endemic to Hawaii.

MYN / Gil Wizen / Huge terrestrial flatworm (Bipalium kewense), Mindo, Ecuador, March. meetyourneighbours.net project

Juergen Freund / Marine polyclad flatworm (Polycladida)

PREMAPHOTOS / Flatworm {Biplanium} on leaf in tropical rainforest, Sumatra, Indonesia

Pascal Kobeh / Glorious flatworm (Pseudobiceros gloriosus) New Caledonia, Pacific Ocean.

Georgette Douwma / Kaleidoscopic image of Brittlestar (Ophiothrix species) on soft coral on which there are Acoel flatworms (Waminoa species). Rinca, Komodo National Park, Indonesia.

David Hall / Polyclad flatworm (Pseudobiceros uniarborensis). Komodo, Indonesia.

Magnus Lundgren / Wild Wonders of China / Free swimming marine flatworm (Tubellaria sp) Green Island, a small volcanic island in the Pacific Ocean, Taiwan

Magnus Lundgren / Wild Wonders of China / Yellow flatworm (Tubellaria sp,) Green Island, a small volcanic island in the Pacific Ocean , Taiwan

Georgette Douwma / Glorious flatworm (Pseudobiceros gloriosus). West Papua, Indonesia. Indo-West Pacific.

Georgette Douwma / Flatworm (Pseudoceros laingensis) West Papua, Indonesia. West Indo-Pacific.

Duncan Murrell / Land Planarian - flat worm, (Bipalium sp.) on a wild banana tree, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, Malaysian Borneo.