| Identification ResourcesThe turbellarians are relatively poorly studied and many species remained undescribed. Identification to species level often relies on detailed examination of the internal anatomy6.However the book "Marine Flatworms: the world of polyclads", by Leslie Newman and Lester Cannon6, contains useful information on separating polyclad families as well as a selection of colour photographs of species. A CD-rom from the same authors, "Fabulous flatworms: a guide to marine polyclads", contains much of the same information as well as some additional material (see bibliographies: further reading).
 A useful website, providing information on turbellarian biology as well as a selection of polyclad species, is http://www.rzuser.uni-heidelberg.de/~bu6/index.html.
 Additionally an online key to over 900 species of flatworm may be found at http://www.discoverlife.org/mp/20q?guide=Rhabditophora&flags=not_no:.
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