Re: aeolid from Fiji

September 15, 2000
From: Bruce Wight

Dear Bill,
Mike Miller told me that the nudibranch I found in Fiji, your Cuthona sp. 4, is Cuthona sibogae. See his page on the species at .

Bruce Wight

Wight, B., 2000 (Sep 15) Re: aeolid from Fiji. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Bruce,
Thanks for your message. I have also had an email from Richard Willan referring me to Marshall & Willan (1999) where it also identified as Cuthona sibogae. It is ironic that I have previously identified it as Cuthona sibogae in a calendar I produced in 1989, and in Mollusca, the Southern Synthesis in 1998. Although some visitors to the Forum think at times I am not cautious enough with my identifications, for some reason I decided to be very cautious when I added this species to the Forum.

I am happy however to throw caution to the winds and identify Cuthona sp. 4 as Cuthona sibogae but before I do has anyone any objections? I have included here a scan of the published painting of Hervia sibogae Bergh, 1905 [Plate 2, fig 17]. The colour and shape of the animal in the painting is similar to the photos on the Forum, and the radula is also similar to Bergh's description. I have added a couple of photos of the radula of Cuthona sp. 4 to the top of the page. It is one of the most beautifully shaped radular teeth I have seen.

Interestingly Marshall & Willan (1999) note this species is only found on the hydroid Sertularella, which is the hydroid I have photographed it on at the top of the page.

Best wishes,
Bill Rudman.

Rudman, W.B., 2000 (Sep 15). Comment on Re: aeolid from Fiji by Bruce Wight. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


Cuthona sibogae

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