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She wrote: "Could also be Pseudoceros sp. 17 in the Marine Flatworms app as well as P. sp. 17 in Marine Flatworms by Newman & Cannon, 2003"
This species was misidentified and originally posted at these websites as Pseudoceros leptostichus Bock, 1913.
I don't know how variable flatworm species are, maybe the specimen #4 is a distinct species.
Newman, L.J. & Cannon, L.R.G. (2003). Marine Flatworms: the world of Polyclads. CSIRO Publishing : Melbourne 112 p
How to cite:
Köhler, E. (2017), published 16 July 2017, Pseudoceros sp. 07 Genus: Lang, 1884
available from http://www.Philippine-Sea-Slugs.com/Look-alike/Platyhelminthes/Pseudoceros_sp_07/Select.htm