Juergen Freund / Marine polyclad flatworm (Polycladida)

Sue Daly / Candy-striped Flatworm (Prostheceraeus vittatus) among anenomes. Pavlaison, Sark, British Channel Islands, July.

David Shale / Flatworm Platyhelminth. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Flatworm Platyhelminth. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Detail of Flatworm Platyhelminth on coral. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Detail of Flatworm Platyhelminth on coral. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Detail of Flatworm Platyhelminth. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

Sue Daly / Candy-striped Flatworm (Prostheceraeus vittatus). Channel Islands, UK, July.

Sue Daly / Candy-striped Flatworm (Prostheceraeus vittatus). Channel Islands, UK, June.

Juergen Freund / Polyclad flatworm (Maiazoon orsaki) Papua New Guinea

Juergen Freund / Polyclad flatworm (Acanthozoon sp.) on the sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Bubble coral (Plerogyra sinuosa) with parasitic flatworms (Waminoa sp). Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Invasion of parasitic Waminoa flatworms (Waminoa sp) on soft coral. Misool, Raja Ampat, West Papua, Indonesia.

Georgette Douwma / Marine flatworms (Cycloporus venetus) on Blue stalked sea squirt / tunicate, Rinca, Komodo National Park, Indonesia, October

Georgette Douwma / Marine flatworm (Cycloporus venetus) on Blue stalked sea squirt / tunicate with egg mass. Rinca, Komodo National Park, Indonesia, October

GEORGETTE DOUWMA / Mushroom coral {Heliofungia actiniformis} with Acoel flatworms {Waminoa sp} Bunaken, Sulawesi, Indonesia

Georgette Douwma / Acoel flatworms (Waminoa sp) on leather coral, Komodo National Park, Indonesia

Sue Daly / Mint sauce worm (Symsagittifera roscoffensis) Channel Isles, UK, August

GEORGETTE DOUWMA / Acoel flatworms (Waminoa sp) on leather coral, Misool, Raja Ampat, West Papua, Indonesia.

GEORGETTE DOUWMA / Acoel flatworms (Waminoa sp) on leather coral, Misool, Raja Ampat, West Papua, Indonesia.

Wild Wonders of Europe / Pitkin / Flatworm (Prostheceraeus splendidus) on rock, 'Turtle Rock', Passage du Cavallo, Lavezzi Archipelago, Corsica, France, September 2008

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Close-up of marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Fuchsia flatworm (Pseudoceros ferrugineus) close-up, Great Barrier Reef, Australia.

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Fuchsia flatworm (Pseudoceros ferrugineus), dorsal view, Great Barrier Reef, Australia.

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Fuchsia flatworm (Pseudoceros ferrugineus), dorsal view, Great Barrier Reef, Australia.

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Fuchsia flatworm (Pseudoceros ferrugineus), dorsal view, Great Barrier Reef, Australia.

Juergen Freund / Fuchsia flatworm (Pseudoceros ferrugineus) close-up, Great Barrier Reef, Australia.

Juergen Freund / Marine polyclad flatworm (Polycladia) and Ocellate phyllidia nudibranch (Phylidia ocellata)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Marine polyclad flatworm (Polycladida)

Juergen Freund / Fuchsia flatworm (Pseudoceros ferrugineus), dorsal view, Great Barrier Reef, Australia.

Juergen Freund / Flatworm {Platyhelmintha} Indo-pacific

Michele Westmorland / Polyclad flatworm (Acanthozoon sp) swimming through water, House Reef at the Jetty, Tufi, Oro Province, Papua New Guinea

Michele Westmorland / Polyclad flatworm (Acanthozoon sp) swimming through water, House Reef at the Jetty, Tufi, Oro Province, Papua New Guinea

Georgette Douwma / Acoel flatworms (Waminoa sp.) on mushroom coral tentacles. Rinca, Indonesia.

Sue Daly / Candy striped Flatworm (Prostheceraeus vittatus), Jersey, Channel Islands, UK

SINCLAIR STAMMERS / Parasite {Schistosoma haematobium} miracidium differential interference contrast, Magnification x240

PREMAPHOTOS / Terrestrial flatworm / Planarian, crawling across damp rainforest floor, Madagascar

PREMAPHOTOS / Terrestrial flatworm {Bipalium sp.} with warning coloures, Malaysia

PREMAPHOTOS / Terrestrial flatworm / Planarian, on leaf in rainforest, Trinidad

PREMAPHOTOS / Terrestrial flatworm / Planarian, crawling across rainforest floor, Trinidad Note - Digestive enzymes secreted from mouth, located in centre of body, to begin external digestion

PREMAPHOTOS / Terrestrial flatworm / Planarian, feeding on snail's eggs, Trinidad

PREMAPHOTOS / Terrestrial flatworm / Planarian, crawling across leaves in rainforest, Trinidad

Nature Production / Reproduction by budding of Planaria {Dugesia japonica}

Nature Production / Planaria {Dugesia japonica} (photomicroscopy x 20)

SINCLAIR STAMMERS / Common liver fluke (Fasciola hepatica) backlit to show diverticulum.

Alan James / Candy striped flatworm (Prostheceraeus vittatus) UK

Juergen Freund / Swimming flatworm (Pseudocercos sp) Indo-Pacific

Juergen Freund / Swimming flatworm (Pseudocercos sp.) Indo-Pacific

GEORGETTE DOUWMA / Acoelous flatworms {Waminoa sp} on tentacles of Mushroom coral {Heliofungia actiniformis} Sulawesi, Indonesia

Willem Kolvoort / Milkwhite flatworm (Dendrocoelum lacteum) on White Water lily seed reflected at the water surface in garden pond, Holland

Willem Kolvoort / Milkwhite flatworm (Dendrocoelum lacteum) on dead leaf in pond, Holland

GEORGETTE DOUWMA / Flatworm (Pseudocerus sp.} Andaman Sea, Myanmar.

Kim Taylor / Group of freshwater Flatworms {Dugesia tigrina}

Kim Taylor / Flatworm {Dendrocoelum lacteum} with newly laid egg capsule.

Kim Taylor / Flatworm {Dendrocoelum lacteum} with newly laid cocoon.

Kim Taylor / Marine flatworm {Platyhelminthes rhabocoela} on algae, UK.

Kim Taylor / Marine flatworms {Platyhelminthes rhabocoela} on algae, UK.

Hans Christoph Kappel / Candy striped flatworm {Prostheceraeus vittatus} Europe

Kim Taylor / 1mm long Marine flatworm {Platyhelminthes sp.) among filamentous algae. Captive, UK.

Fred Bavendam / Coral Shrimp (Vir philippinensis) living on Rounded Bubblegum Coral (Plerogyra sinuosa) green spots are Acoelous Flatworms, Manado, North Sulawesi, Indonesia

Constantinos Petrinos / Flatworm on sea floor {Platyhelminthes} Sulawesi, Indonesia

TOM WALMSLEY / Flatworm and eggs {Platyhelminthes}

Constantinos Petrinos / Flatworm {Thysanozoon nigropapillosum} Sulawesi Indonesia

Nature Production / Planaria flatworm {Dugesia japonica} Japan

Juergen Freund / Flatworms on Bubble coral {Platyhelminthes, Waminoa species} Indo Pacific