Known only from Hong Kong - probably more widespread.
Hong Kong. LOWER LEFT: 12 Apr 1983 - S. Flat Reef, Tolo Channel. UPPER RIGHT: 12 Apr 1983 - S. Flat Reef, Tolo Channel. LOWER RIGHT: 14 Apr 1983 - E Pak Sha Chau, Mirs Bay. PHOTOS: Bernard Picton.
Characterised by a series of white marks down the midline and a bluish region near the end of the cerata, rhinophores and oral tentacles which are all capped with white or cream yellow. The radular morphology is also unique and the unbranched digestive gland duct in the cerata indicates that this species does not have a zooxanthellae symbiosis. I have no records of the length of living animals, but preserved specimens reach about 20mm.
• Rudman, W.B. (1981) The anatomy and biology of alcyonarian feeding aeolid opisthobranch molluscs and their development of symbiosis with zooxanthellae. Zoological Journal of the Linnean Society, 72: 219-262.
• Rudman, W.B. (1991) Further studies on the taxonomy and biology of the octocoral-feeding genus Phyllodesmium Ehrenberg, 1831 (Nudibranchia: Aeolidoidea). Journal of Molluscan Studies, 57(2): 167-203.
Rudman, W.B., 2001 (March 7) Phyllodesmium opalescens Rudman, 1991. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/phylopal
September 21, 2005
From: Jeff Rosenfeld
Here's a shot of Phyllodesmium opalescens taken in Anilao, Luzon Island, Philippines in April, 2004. As you suspected, its range is more widespread.
Locality: Anilao, Luzon Island, Philippines.Depth: 40 feet. Length: 12 mm. April, 2004. Photographer: Jeff Rosenfeld
email@example.comRosenfeld, Jeff, 2005 (Sep 21) Phyllodesmium opalescens from the Philippines. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/14685
This is a nice find. It certainly looks like P. opalescens, down to the broken white line down the dorsal midline. It certainly moves its potential geographic distribution down into the Indo-west Pacific proper.
January 25, 2003
From: Dong Bum, Koh
I found this tiny nudibranch on gray sponges in Moon islet, on 14th Dec. 2002. Depth 15m. Water/Temp: 18 degrees. Photo: Dong Bum, Koh
Can you please verify the ID.
From Dong Bum,Koh
firstname.lastname@example.orgKoh, D.B., 2003 (Jan 25) Phyllodesmium opalescens from South Korea. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8841