Re: Colour forms of Favorinus tsuruganus

June 27, 2007
From: Colin Ogden

Concerning message #19909:

Hi Bill,
Richard Swann's photos of  Favorinus tsuruganus fascinated me, and then one of the other dive operators here at Sodwana gave me a copy of one of his photos to get an ID on it. It appears to me a red form of Favorinus tsuruganus,  but it is actually laying eggs on another egg ribbon from a Hexabranchus sanguineus (I think).

Locality: Sodwana Bay, 22 metres, South Africa, Indian, Upper photo: May 2007, Reef. Length: 20 mm. Photographer: Greg de Valle. Lower photo: February 2007, Photo: Colin Ogden.

Regards
Colin

scubaco@iafrica.com

Ogden C. M., 2007 (Jun 27) Re: Colour forms of Favorinus tsuruganus. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19965

Dear Colin,

Species of Favorinus are egg eaters, and the colour of their cerata, or rather the digestive gland duct in their cerata, changes as the colour of their food changes. I have a photo on the Fact Sheet of Favorinus japonicus changing colour, the cerata at the front being a different colour from those further back on the body. If you look at earlier messages on F. tsuruganus you will see the eggs of Hexabranchus appear to be one of its favourite foods and a good place to lay its eggs.

Best wishes,
Bill Rudman

Rudman, W.B., 2007 (Jun 27). Comment on Re: Colour forms of Favorinus tsuruganus by Colin Ogden. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/19965

Factsheet

Favorinus tsuruganus

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