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Pleurobranchus weberi (Bergh 1905) [Oscanius]

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During a dive at "Japanese Cargo Wreck" near Malapascua Island, (this divesite is also called "Tapilon wreck" because of the name of the nearest village) - with very strong current - I discovered my first Pleurobranchus weberi.
I saw Pleurobranchus weberi before only at Mike Miller's Slug Site. It is characterised by a dark red background colour and many large 'white' double rings. I think these double rings are translucent, some kind of sticky mucus, the colour of them depends on the colour of the sand it is crawling on, white sand makes white rings, tan sand makes tan rings, etc. This is a very large sea-slug, it grows up to 20 cm.
More information on Pleurobranchus weberi are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 31 July 2017, Pleurobranchus weberi (Bergh 1905)
available from https://www.Philippine-Sea-Slugs.com/Pleurobranchomorpha/Pleurobranchus_weberi.htm