Favorinus cf. mirabilis
Baba, 1955

Order: NUDIBRANCHIA
Suborder: AEOLIDINA
Family: Glaucidae

PHOTO

NE Sulawesi, Indonesia, 13 July 2002. approx 15mm long. Photo: Jim Anderson.

Superficially this animal looks very like Favorinus tsuruganus, which is reported to feed on Hexabranchus eggs. However it differs in a number of features. Although they both have yellow digestive gland ducts in the cerata, in F. tsuruganus the body and the oral tentacles are opaque white and there is a black tip to the cerata, which is unlikely to be food related. Also the rhinophores seem to have four or more leaflets, rather than the three 'cup-shaped swellings' found in F. tsuruganus. In your animal the oral tentacles and the body are translucent orange and the tips of the cerata are white, not black. I suspect that this is a colour form of F. mirabilis. [See my comments in Jim Anderson's message. I have moved messages concerning Favorinus sp. 2 and Favorinus sp. 6 to this page as Favorinus cf. mirabilis.

Reference:
• Baba, K. (1955) Opisthobranchia of Sagami Bay. Supplement. Iwanami Shoten, Tokyo.

Authorship details
Rudman, W.B., 2002 (July 25) Favorinus cf. mirabilis Baba, 1955. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/favocfmira

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