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

Juergen Freund / Marine polyclad flatworm (Polycladida)

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

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

Emanuele Biggi / Hammerhead worms (Bipalium sp) on leaf, Sarawak. Borneo.

Constantinos Petrinos / Acoel flatworms (Waminoa sp.) on Bubble Coral (Plerogyra sinuosa) Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Acoel flatworms (Waminoa sp.) on coral. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Acoel flatworms (Waminoa sp.) on coral. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Acoel flatworms (Waminoa sp) on polyps of Bubble coral (Plerogyra sinuosa) Indonesia. This flatworm can cover the whole surface of some corals, leaving them no way to catch plankton and their symbioti...

Georgette Douwma / Acoel flatworms (Waminoa sp) on polyps of Bubble coral (Plerogyra sinuosa) Indonesia. This flatworm can cover the whole surface of some corals, leaving them no way to catch plankton and their symbioti...

Alex Mustard / Long exposure of a juvenile Harlequin sweetlips (Plectorhinchus chaetodonoides), which dance as a defence from predators. The dance may mimic the movements of poisonous flatworms or may simply confuse...

Franco Banfi / Flatworm (Maiazoon orsaki) Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean