APHOTOMARINE

An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland by David Fenwick.

Marine flatworms (Platyhelminthes)
Marine Polyclad Flatworms

Polycladida (Order) > Acotylea (Suborder) > Leptoplanoidea (Superfamily) > Leptoplanidae (Family)

Leptoplana
Leptoplana tremellaris (Müller OF, 1773)
- A leptoplanid polyclad turbellarian

Leptoplana tremellaris (Müller OF, 1773) ?
- A leptoplanid polyclad turbellarian

Polycladida (Order) > Acotylea (Suborder) > Leptoplanoidea (Superfamily) > Pleioplanidae (Family)

Pleioplana
Pleioplana atomata (Müller OF, 1776) ?
- A pleioplanid polyclad turbellarian

Polycladida (Order) > Acotylea (Suborder) > Leptoplanoidea (Superfamily) > Stylochoplanidae (Family)

Comoplana ?
Comoplana agilis (Lang, 1884) - A Marine Flatworm
Comoplana ? sp. 1 - A Marine Flatworm
Both the above found with Stylochoplana maculata, it is possible that the turbellarians above may be varients of this species. An expert opinion is needed.

Stylochoplana
Stylochoplana maculata (Quatrefage, 1845)
- A marine flatworm

Polycladida (Order) > Cotylea (Suborder) > Euryleptoidea (Superfamily) > Euryleptidae (Family)

Cycloporus
Cycloporus papillosus (Sars, 1878)
- A euryleptid polyclad turbellarian

Eurylepta
Eurylepta cornuta (Müller OF, 1776)
- A euryleptid polyclad turbellarian

Oligocladus
Oligocladus sanguinolentus Lang, 1884
- A euryleptid polyclad turbellarian

Prostheceraeus
Prostheceraeus vittatus (Montagu, 1815)
- Banded or Candy-striped flatworm

Stylostomum
Stylostomum ellipse (Dalyell, 1853)
- A euryleptid polyclad turbellarian

Polycladida (Order) > Cotylea (Suborder) > Euryleptoidea (Superfamily) > Prosthiostomidae (Family)

Prosthiostomum
Prosthiostomum siphunculus (Delle Chiaje, 1822)
- A marine flatworm

Triclad Flatworms (Tricladida)

Tricladida (Order) > Maricola (Infraorder) > Cercyroidea (Superfamily) > Cercyridae (Family) > Cercyrini (Subfamily)

Sabussowia
Sabussowia dioica (Claparède, 1863)
- A marine triclad flatworm

Tricladida (Order) > Maricola (Infraorder) > Procerodoidea (Superfamily) > Procerodidae (Family)

Procerodes
Procerodes littoralis (Ström, 1768)
- A marine triclad flatworm

Parasitic Flatworms

Rhabditophora (Class) > Eulecithophora (Infraclass) > Revertospermata (Superorder) > Fecampiida (Order) > Fecampiidae (Family)

Fecampia
Fecampia erythrocephala Giard, 1886
- A Parasitic crab flatworm (cocoons)

Fecampia erythrocephala Giard, 1886 ?
- A Parasitic crab flatworm (adult - prawn host)

Trematoda (Class) > Digenea (Subclass) > Plagiorchiida (Order) > Lepocreadiata (Suborder) > Lepocreadioidea (Superfamily) > Lepocreadiidae (Family)

Opechona
Possibly a species of Opechona - A parasitic trematode that includes the hydroid Leuckartiara octona as a host in its complex multi-host life cycle.

Platyhelminthes (Phylum) > Neodermata (Subphylum) > Trematoda (Class) > Digenea (Subclass)

The encysted metacercaria stage of a trematode digenean parasite on the fish, Cyclopterus lumpus, the Lumpsucker; Opechona bacillaris (Molin, 1859) Dollfus, 1927 ?

Probable new species of parasitic turbellarian on
the opisthobranch mollusc Runcina coronata

Other Flatworms

Xenacoelomorpha (Phylum) > Acoelomorpha (Subphylum) > Acoela (Order) > Convolutidae (Family)

Convoluta
Convoluta convoluta (Abildgaard, 1806)
- An acoela flatworm (specimen 1)

Convoluta convoluta (Abildgaard, 1806)
- An acoela flatworm (specimen 2)

Specimen two likely to be older than specimen one due to the presence of white markings on the body.

Rhabditophora (Class) > Eulecithophora (Infraclass) > Prolecithophora (Order) > Plagiostomidae (Family)

Plagiostomum
Plagiostomum sulphureum Graff, 1882 ?
- A plagiostomid flatworm

Plagiostomum vittatum (Frey & Leuckart, 1847)
- A plagiostomid flatworm

Vorticeros
Vorticeros auriculatum (Müller OF, 1784)
- A plagiostomid flatworm

Vorticeros luteum Hallez, 1879
- A plagiostomid flatworm

Unidentified Prolecithophora
On Bladder Wrack from Mousehole, Cornwall. 13.08.16.
Small white and orange striped flatworm similar
looking to the mollusc genus Rhodope. 21.03.15.

Rhabditophora (Class) > Eulecithophora (Infraclass) > Rhabdocoela (Order) > Typhloplanoida (Suborder) > Trigonostomidae (Family) > Paramesostominae (Subfamily)

Astrotorhynchus
Astrotorhynchus bifidus (McIntosh, 1874)
- A trigonostomid flatworm

Rhabditophora (Class) > Trepaxonemata (Subclass) > Neoophora (Infraclass) > Eulecithophora (Infraclass) > Rhabdocoela (Order) > Kalyptorhynchia (Suborder) > Eukalyptorhynchia (Infraorder) > Polycystididae (Family) > Polycystidinae (Subfamily)

Polycystis
Polycystis naegelii Kölliker, 1845 ? - A marine flatworm

Rhabditophora (Class) > Trepaxonemata (Subclass) > Neoophora (Infraclass) > Proseriata (Order) > Lithophora (Infraorder) > Monocelididae (Family) > Monocelidinae (Subfamily)

Monocelis
Monocelis lineata (Müller OF, 1773) - A marine flatworm

Help needed with identity
Turbellarian in Pearlsides, Maurolicus muelleri. 13.03.14.
Small white and orange striped flatworm similar
looking to the mollusc genus Rhodope. 19.04.15.

Yellow marine flatworm, Croyde, North Devon. 17.09.16.
Plagiostomum vittatum ? Penzance. 20.05.15
Blue marine flatworm found at Marazion 19.04.15.
Orange striped flatworm Battery Rocks. 02.04.17.
Orange striped flatworm Chimney Rocks, 17.04.15.
Small flatworm found at Newlyn Marina 07.01.17.
Small flatworm Newlyn Harbour slipway 08.04.15.
Small flatworm Newlyn Harbour slipway 18.10.16.
Flatworm specimen (1) from Hayle. 19.07.15 / 07.06.18.
Flatworm specimen (2) from Carnsew Pool 19.07.15.
Flatworm specimen (3) from Carnsew Pool 19.07.15.
Flatworm specimen (4) from Carnsew Pool 19.07.15.
Microscopic flatworm found in Newlyn Harbour 02.01.14.
Yellow flatworm found at Newlyn Harbour 01.09.15.
Orange flatworm - Newlyn Marina 11.08.15.
Flatworm found at Newlyn Marina 11.07.15.
Flatworm found at Newlyn Marina 04.05.15.
Flatworm found at Newlyn Marina 29.04.15.
Flatworm found at Newlyn Marina 02.10.14.
Flatworm found at Newlyn Marina 06.09.16.

Flatworm found at Newlyn Marina 22.10.18.
Small flatworm on algae from Penzance Harbour 11.05.13.
Flatworm found at Sennen Cove, Cornwall. 15.10.12.
Is this a cocoon forming Flatworm ? Pelagic ?

Marine flatworms are notoriously difficult to identify, many needing to be dissected and microscopically examined. The date and habitat where the flatworm was found is also very important information when identifying them; e.g. some may be more frequently on the middleshore close to mussel colonies, others in less saline situations.

Freshwater Flatworms

Tricladida (Order) > Continenticola (Suborder) > Planarioidea (Superfamily) > Planariidae (Family)

Polycelis
Polycelis felina (Dalyell, 1814) - A freshwater flatworm

For more images of flatworms visit the following sites APHOTOFAUNA and Roscadghill Parc Wildlife.

Sealife Survey
Record UK marine life using the the Marine Biological Association's Sealife Survey (external link)

Marine Flatworms Platyhelminthes UK