Favorinus pacificus
Baba, 1937

Order: NUDIBRANCHIA
Suborder: AEOLIDINA
Family: Glaucidae

DISTRIBUTION

Known from Japan and Sth Korea

PHOTO

Upper: Osezaki, Izu peninsula, Japan mainland. Depth: about 10 m. Length: 12 mm. unknown, March, 2004. sandy, shallow water. Photographer: Mr.Tomohiko Kurihara. Lower: Sasu Harbor, Jeju Island, Sth Korea. Depth: 5 m. Length: 8 mm. 27 June 2004. Sandy bottom with Rock .Photographer: Dong Jin Jwa

The following description is part of the original description from Baba (1937), based on a single specimen from Tomioka, Amakusa, Japan:

'[10 mm long alive] The antero-lateral corners of the head are continued out into two exceedingly slender oral tentacles. The rhinophores are a little shorter and cylindro-conical, with indistinct constrictions along the whole length. The margin of the back bears a small number of fusiform branchial papillae in 7 oblique rows .....  The foot is fairly narrow, passing off to a point behind. The front edge is rounded off and its corners are produced outward into tentaculiform processes.

The general colour of the body is translucent white and this is true of the oral tentacles, tail and foot. The rhinophores are chocolate tinted, except at the distal third which is colourless. The branchial papillae [cerata] are dark yellow almost up to the tip which terminates in a white cap, with a purple marking below. [Teeth without any sign of denticles].'

As I discuss in a separate message [#13616] the animals illustrated here are probably this species, but they differ in some aspects of Baba's description.

• Baba, K. (1937} Opisthobranchia of Japan (II). Journal of the Department of Agriculture, Kyushu Imperial University, 5(7): 289-344

Authorship details
Rudman, W.B., 2005 (April 26) Favorinus pacificus Baba, 1937. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/favopaci

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