October 8, 2007
From: Kwang Kai Leong
I found this nudibranch when I was diving in Tioman. I think it is a Pleurobranchus but not sure of which. Could kindly Identify it.
Locality: Hyde Patch, Tomok Island off Tioman Island, 12.5 meters, Pahang, Malaysia, South China Sea, 17 September 2007, Sandy bottom, with softcorals and sponge in patchs.. Length: 2 to 2.5 inches. Photographer: KL Kwang.
firstname.lastname@example.orgKwang, K. L. , 2007 (Oct 8) Aldisa pikokai? from Malaysia. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20753
This is a species of the dorid genus Aldisa, and I am pretty sure it is Aldisa pikokai. Some species of Aldisa seem to mimic sponges by their colour and general shape, in particular the presence of two or three pits on the back which mimic the inhalent siphons or ostia of large sponge colonies. In your photos there appear to be raise tubercles or thick papillae scattered over the mantle. I don't recall those being present in A. pikokai so it is possible this is an unnamed species.