Known only from Indonesia, Philippines.
Malapascua Is., Philippines, divesite "Japanese Cargo Wreck". Depth: 25m. Length: 18-20cm. 23 Feb. 2003. Photo: Erwin Koehler
Large purplish brown pleurobranch with white double rings on the mantle. Mantle with small rounded tubercles. Apart from a record from Mindinao, Philippines on Mike Miller's site [http://slugsite.us/bow/nudwk132.htm], I know of no other published record of this species since its original description from Saleyer Is., S of Celebes, Indonesia (Bergh, 1905). The colour plate [Plate 2, fig 1 - as Oscanius weberi] clearly shows the conspicuous double white rings on the mantle. This species has colour similarities to the dark purple colour form of Pleurobranchus forskali, but in that species if white rings are present, they are single half circles which line the outer edge of each of the mantle tubercles. In P. weberi, the mantle tuberles are much smaller, and the white circles are independent of the tubercles. Like P. forskalii this species apparently grows to quite a large size - at last 20cm.
• Bergh, L.S.R. (1905). Die Opisthobranchiata. Siboga Expeditie Report, 50: 248pp., Pls 1-20.
Rudman, W.B., 2003 (April 13) Pleurobranchus weberi (Bergh, 1905). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/pleuwebe
Re: Pleurobranchus weberi? from Western Australia
From: Erwin Koehler, July 19, 2007
Pleurobranchus weberi? from Western Australia
From: Brad Cox, July 18, 2007
Pleurobranchus weberi from The Philippines
From: Paul Osmond, May 5, 2005
Pleurobranchus weberi - another sighting
From: H.Haluk Akbatur, December 11, 2003
Pleurobranchus weberi from the Philippines
From: Erwin Koehler, April 15, 2003