Phyllodesmium magnum is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.Rosenberg, G.; Bouchet, P. (2015). Phyllodesmium magnum. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-10-07
Distribution This species was described from New Caledonia with additional material from NW Australia, the Marshall Islands and Hong Kong. The distribution of Phyllodesmium magnum includes North Kermadec and Guam.Rudman, W.B., 1999 (November 22) Phyllodesmium magnum Rudman, 1991. [In] Sea Slug Forum. Australian Museum, Sydney.
Description This species grows to 130 mm in length. It is one of the Phyllodesmium species which contain zooxanthellae.
Ecology Phyllodesmium magnum feeds on a soft coral Sinularia sp.
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