Found throughout the tropical western Pacific and Indian Oceans.
UPPER: Two animals showing how the colour of the animal changes as the colour of its food changes. The animal on the left has been feeding on green aplysiid eggs for some time and the cerata, containing green pigment from the food, are uniformly green. The animal on the right was previously feeding on pink eggs and has only recently moved to the green egg mass. Only the front cluster of cerata have, up to the time of the photograph, turned green. (Solitary Islands, Coffs Harbour Region, New South Wales. March 1988).
LOWER: Green animal on egg mass of Aplysia. The tiny dots in the egg mass are the individual eggs. In the bottom right corner you can see part of a pink animal, which has only recently moved onto this egg mass. (Solitary Islands, Coffs Harbour Region, New South Wales. March 1988).
PHOTOS: Bill Rudman.
• Baba, K. (1949). Opisthobranchia of Sagami Bay collected by His Majesty The Emperor of Japan. Tokyo, p. 1-194, pls. 1-50
Rudman, W.B., 1998 (April 25) Favorinus japonicus Baba, 1949. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/favojap
Favorinus japonicus from Reunion Island
From: Hugues Flodrops, March 31, 2009
Favorinus japonicus on Hexabranchus eggs
From: Colin Ogden, September 25, 2007
More photos of Favorinus japonicus
From: Dong Bum Koh, May 10, 2005
Favorinus japonicus and F. tsuruganus together
From: Dong Bum Koh, May 3, 2005
Re: Favorinus eating Hexabranchus eggs
From: Yves Coze, December 1, 2003
Favorinus? from Zushi, Japan
From: Akira Kurabayashi, November 16, 2003
Favorinus eating Hexabranchus eggs
From: Yves Coze, September 5, 2003
Favorinus on Hexabranchus eggs
From: Rokus Groeneveld, July 12, 2003
Re: Favorinus japonicus secondary metabolites
From: Jennifer Sneed, March 8, 2002
Favorinus japonicus secondary metabolites
From: Jennifer Sneed, March 6, 2002
Favorinus japonicus from Heron Island
From: Julie Marshall, March 5, 2000
Favorinus japonicus from Sulawesi
From: Lindsay Warren, February 27, 2000
Egg Predation - Favorinus japonicus
From: Bill Rudman, April 25, 1998