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Pleurobranchus caledonicus  Risbec, 1928

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Pleurobranchus caledonicus is characterized by a dark red-brown 'hole' spot in the centre of the mantle surrounded by a brighter region. This central spot varies in size and may be absent in some animals. The colour of the mantle varies from cream to pale red-violet with scattered white flecks. Risbec (1928) describes the mantle as deep yellowish with maroon brown patching. Its notum is covered with very small tubercles ringed with darker brown pigment at their bases.
Let me quote Cory Pittman and Pauline Fiene, they write at their website Sea Slugs of Hawaii:
"This species is similar to the Atlantic Berthella africana (Pruvot-Fol, 1953) and is currently listed on the Sea Slug Forum under the name Pleurobranchus caledonicus Risbec, 1928. It seems likely that further work will confirm it as the latter species but place it in the genus Berthella as suggested on the forum."
Pleurobranchus caledonicus was described from New Caledonia, now there are records from Okinawa, Japan, from the Marshall Islands, from Hawaii, from Queensland, Australia, and from Guam.
More information on Pleurobranchus caledonicus are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 22 July 2016, Pleurobranchus caledonicus  Risbec, 1928
available from http://www.Philippine-Sea-Slugs.com/Pleurobranchomorpha/Pleurobranchus_caledonicus.htm